Easy Homemade Onion Gravy Recipe UK – Rich, Delicious Gravy Using Homegrown Onions

There’s something wonderful about sitting down to a homemade meal with a generous helping of rich, delicious onion gravy.

Whether you’re serving sausages and mash, a traditional Sunday roast, Yorkshire puddings or a comforting vegetable dinner, a good homemade onion gravy can make all the difference.

And if you’ve grown your own onions on the allotment, it’s an even better way to enjoy your harvest.

This homemade onion gravy recipe UK uses everyday ingredients to create a lovely rich gravy packed with sweet, slowly caramelised onions.

The best part is that it’s easy to make, inexpensive and can be adapted for vegetarian or vegan diets.

Here at Gardening with Ben, I’ve been growing vegetables on the allotment for many years, and I always enjoy finding delicious ways to use the produce we’ve grown.

After all, there’s nothing better than growing your own food and then turning it into something tasty for dinner.

In this complete guide, I’ll show you how to make homemade onion gravy step by step, which onions are best, how to thicken your gravy, how to make it without meat stock and how to freeze leftovers for another day.

Why Make Homemade Onion Gravy?

It’s easy to reach for a packet of instant gravy granules, but making your own onion gravy gives you much more control over the flavour.

You can choose how dark you want the onions, how thick the gravy becomes and which herbs or seasonings to include.

There are plenty of reasons to give this recipe a try.

• Delicious flavour: Slowly caramelised onions give the gravy natural sweetness and depth.
• Budget-friendly: Uses inexpensive ingredients, especially when you’ve grown your onions.
• Easy to prepare: No complicated equipment or cooking techniques.
• Versatile: Perfect for sausages, mash, roast dinners and vegetarian meals.
• Customisable: Make it vegetarian, vegan, gluten-free or richer for special occasions.
• Freezer-friendly: Prepare extra portions to use later.
• Great for homegrown produce: An excellent way to enjoy your allotment onions.

The secret is taking a little time to cook the onions properly before adding the stock.

Homemade Onion Gravy Recipe at a Glance

Details	Information
Recipe	Homemade onion gravy
Cuisine	British
Preparation time	10 minutes
Cooking time	35–40 minutes
Total time	45–50 minutes
Servings	4
Difficulty	Easy
Vegetarian	Yes, with vegetable stock and suitable Worcestershire sauce
Vegan	Yes, with plant-based butter or oil
Freezer-friendly	Yes

Ingredients for Homemade Onion Gravy

This recipe makes enough gravy for approximately four servings.

Main Ingredients

• 3 medium onions, approximately 450g, peeled and thinly sliced.
• 25g butter.
• 1 tablespoon olive oil.
• 2 tablespoons plain flour.
• 500ml vegetable stock or beef stock.
• 1 teaspoon balsamic vinegar.
• 1 teaspoon Worcestershire sauce, optional.
• ½ teaspoon dried thyme or 1 teaspoon fresh thyme leaves.
• ½ teaspoon soft brown sugar, optional.
• Freshly ground black pepper.
• Salt, to taste.

Optional Extras

For a slightly richer flavour, you can also add:

• 1 small garlic clove, finely chopped.
• 1 teaspoon wholegrain mustard.
• A small splash of red wine.
• A little fresh rosemary.
• 1 teaspoon soy sauce for additional savoury flavour.

The basic recipe works beautifully without these extras.

If you’re making vegetarian gravy, remember that traditional Worcestershire sauce contains anchovies. Choose a vegetarian alternative or leave it out.

Which Onions Are Best for Homemade Onion Gravy?

Different onion varieties can produce slightly different flavours.

The good news is that most ordinary cooking onions work very well.

Yellow or Brown Onions

These are my first choice for homemade onion gravy.

Yellow onions develop a wonderful savoury sweetness when cooked slowly.

They’re easy to grow in UK gardens and allotments, and many varieties store well.

If you’ve harvested onions such as Sturon or Centurion, they’re ideal for this recipe.

Red Onions

Red onions also make delicious gravy.

They can create a slightly sweeter flavour and a darker reddish-brown colour.

Red onion gravy goes particularly well with sausages, roasted vegetables and vegetarian dishes.

White Onions

White onions are another suitable option.

They can have a slightly different flavour from yellow onions, but they’ll still caramelise beautifully.

Can You Mix Onion Varieties?

Absolutely.

If you’ve got a few different onions left from your allotment harvest, you can combine them.

For example, try using two yellow onions and one red onion.

The mixture can produce an interesting combination of sweetness and savoury flavours.

How to Make Homemade Onion Gravy: Step-by-Step

This traditional method is straightforward and creates a rich gravy with plenty of onion flavour.

Step 1: Prepare the Onions

Peel your onions and remove their outer skins.

Cut each onion in half, then slice into reasonably thin, even pieces.

Try to keep the slices roughly the same thickness so they cook at a similar rate.

You don’t need to chop them into tiny pieces.

Longer slices of onion give homemade onion gravy its lovely traditional texture.

Step 2: Heat the Butter and Oil

Place a large frying pan or saucepan over a medium-low heat.

Add the butter and olive oil.

Allow the butter to melt gently.

The butter provides flavour, while the oil helps coat the onions evenly.

For a dairy-free gravy, use a little extra olive oil instead of butter.

Step 3: Add the Sliced Onions

Add the onions to the pan.

Stir well so the slices are coated in the melted butter and oil.

Cook gently for approximately 10 minutes, stirring occasionally.

The onions should begin softening and becoming translucent.

Avoid rushing this stage.

Step 4: Caramelise the Onions

Continue cooking over a low to medium-low heat for another 15–20 minutes.

Stir regularly to prevent sticking.

The onions should gradually become soft, golden brown and sweet.

If they begin catching on the bottom of the pan, add a small splash of water and reduce the heat.

You can add the optional brown sugar at this stage, although onions naturally contain sugars and usually don’t need any added.

Gardening with Ben tip: A little patience makes all the difference. Properly caramelised onions give gravy its wonderful rich flavour without needing lots of additional ingredients.

Step 5: Add Garlic if Using

If you’re adding garlic, stir it into the caramelised onions.

Cook for approximately one minute.

Don’t allow the garlic to burn.

Step 6: Stir in the Flour

Sprinkle two tablespoons of plain flour over the onions.

Stir thoroughly until the flour coats the onion mixture.

Cook gently for approximately one to two minutes.

This helps remove the raw flour taste and prepares the gravy for thickening.

Step 7: Gradually Add the Stock

Slowly pour a little stock into the pan while stirring.

Allow it to combine with the flour and onions before adding more.

Continue gradually until all 500ml of stock has been incorporated.

This helps produce a smooth gravy without lumps.

You can use vegetable stock, beef stock or another suitable stock depending on the meal you’re serving.

Step 8: Add the Flavourings

Stir in:

• The balsamic vinegar.
• Thyme.
• Worcestershire sauce, if using.
• Freshly ground black pepper.

Taste the gravy before adding salt.

Some stock cubes and sauces already contain significant amounts of salt.

Step 9: Simmer Until Thickened

Bring the mixture to a gentle simmer.

Cook for approximately 5–10 minutes, stirring occasionally.

The gravy should begin thickening as the flour cooks and the liquid reduces slightly.

If it’s too thick, add a splash of water or stock.

If it’s too thin, allow it to simmer for a little longer.

Step 10: Serve Your Homemade Onion Gravy

Once the gravy reaches your preferred consistency, remove it from the heat.

Taste again and adjust the seasoning if necessary.

Serve immediately with your favourite homemade meal.

This gravy is particularly delicious poured over sausages and creamy mashed potatoes.

How to Make Onion Gravy for Sausages and Mash

One of the most popular ways to serve onion gravy in the UK is with traditional bangers and mash.

The sweet, savoury onions complement sausages beautifully.

Simple Bangers and Mash Serving Idea

For four people, you’ll need:

• 8 sausages.
• Approximately 1kg potatoes.
• A little butter and milk for mashing.
• One batch of homemade onion gravy.
• Optional peas, carrots or cabbage.

Cook the sausages thoroughly according to their instructions.

Meanwhile, peel and boil the potatoes until tender.

Drain and mash with butter and milk.

Serve the sausages over the mashed potatoes and pour the homemade onion gravy generously over the top.

Add homegrown vegetables if you have them available.

It’s a fantastic, comforting British meal.

How to Make Vegetarian Onion Gravy

This recipe is very easy to make vegetarian.

Simply use vegetable stock rather than meat stock.

Make sure any Worcestershire sauce is vegetarian-friendly or replace it with a small splash of soy sauce.

The slowly caramelised onions provide so much natural flavour that you don’t need meat stock to make a delicious gravy.

Vegetarian onion gravy is excellent with:

• Vegetarian sausages.
• Mashed potatoes.
• Vegetable pies.
• Nut roasts.
• Yorkshire puddings, made with vegetarian ingredients.
• Roasted root vegetables.

How to Make Vegan Onion Gravy

For vegan onion gravy, make the following changes:

Replace the butter with olive oil or vegan butter.

Use vegetable stock.

Omit ordinary Worcestershire sauce unless it is specifically labelled vegan.

Use a suitable vegan soy sauce or a little extra balsamic vinegar for flavour.

The rest of the method remains the same.

This produces a rich onion gravy without dairy or animal-derived ingredients.

Can You Make Onion Gravy Without Flour?

Yes.

Flour is useful because it thickens gravy, but there are alternatives.

Cornflour

Cornflour is one of the easiest substitutes.

Instead of adding plain flour to the onions, make the recipe using the stock and flavourings.

Mix approximately 1 tablespoon cornflour with 2 tablespoons cold water.

Gradually stir the mixture into the simmering gravy.

Allow it to cook until thickened.

Add a little more slurry if necessary.

Make sure any stock cubes and sauces are also gluten-free if preparing the gravy for someone avoiding gluten.

Reduce the Stock

Another option is to simmer the gravy for longer, allowing some liquid to evaporate.

This gives a more concentrated flavour, although it may not produce the same thick consistency.

Blend Some of the Onions

You can blend a small portion of the onion mixture before returning it to the saucepan.

This creates a smoother, thicker texture without needing quite as much flour.

How to Make Onion Gravy Thicker

If your gravy looks too watery, don’t worry.

There are several ways to fix it.

First, allow the gravy to simmer gently for a few more minutes.

As some liquid evaporates, the gravy will thicken.

Alternatively, mix a little cornflour with cold water and gradually stir it into the simmering gravy.

Avoid adding dry flour directly into hot gravy because it can form lumps.

Remember that gravy often thickens slightly as it cools.

How to Fix Onion Gravy That Is Too Thick

If your gravy becomes too thick, simply add a little more liquid.

Vegetable stock works well, but water can also be used.

Add a small amount at a time, stirring thoroughly.

Continue until the gravy reaches your preferred consistency.

Taste afterwards because adding liquid can dilute the seasoning.

Why Does My Onion Gravy Taste Bitter?

A bitter taste can develop if the onions or garlic have burned.

This sometimes happens when the heat is too high during caramelisation.

Onions need time to soften and develop their sweetness.

If they become blackened or scorched, their flavour may become unpleasant.

How to Avoid Bitter Onion Gravy

• Use a low to medium-low heat.
• Stir the onions regularly.
• Avoid burning the garlic.
• Add small splashes of water if the pan becomes too dry.
• Don’t use excessively dark or burned pan scrapings.

If the gravy tastes very bitter because the onions have burned badly, it’s usually best to start again.

Can You Make Onion Gravy Without Wine?

Absolutely.

This recipe doesn’t require wine.

The caramelised onions, stock, balsamic vinegar and herbs provide plenty of flavour.

A little red wine can add richness, but it’s entirely optional.

If you prefer not to cook with alcohol, simply leave it out.

Can You Use Frozen Onions to Make Gravy?

Yes.

Frozen chopped or sliced onions work well in cooked gravy recipes.

However, they release more moisture than fresh onions.

Add the frozen onions to your pan and cook until the excess water evaporates.

Then continue cooking slowly until the onions become golden and caramelised.

You may need a little extra time compared with fresh onions.

This is a useful way to enjoy your allotment harvest throughout winter.

Can You Make Onion Gravy Ahead of Time?

Yes, which makes it particularly useful for Sunday dinners and busy evenings.

Prepare the gravy as normal.

Cool it promptly, then transfer it into a covered container and refrigerate.

Use it within 48 hours or freeze it.

When you’re ready to serve, reheat until steaming hot throughout.

If the gravy has become too thick during storage, add a small splash of water or stock while reheating.

Only reheat leftovers once.

Can You Freeze Homemade Onion Gravy?

Yes!

Homemade onion gravy freezes very well.

Freezing is particularly useful if you’ve made a large batch or have plenty of onions from the allotment.

How to Freeze Onion Gravy

1. Allow the freshly cooked gravy to cool quickly.
2. Divide into individual portions.
3. Transfer into suitable freezer-safe containers.
4. Leave enough space for the gravy to expand.
5. Label each container with the contents and date.
6. Freeze promptly at approximately -18°C.

For the best quality, aim to use frozen onion gravy within around three months.

How to Defrost Onion Gravy

The safest general approach is to defrost the gravy overnight in the fridge.

Once defrosted, reheat thoroughly until steaming hot throughout.

Stir well to ensure even heating.

If the gravy separates slightly, whisk or stir while heating.

Never leave frozen gravy on the kitchen counter for extended periods to defrost.

How Long Does Homemade Onion Gravy Last in the Fridge?

According to UK Food Standards Agency guidance, cooked leftovers should be cooled and refrigerated within one to two hours.

Use refrigerated leftovers within 48 hours or freeze them.

Keep the gravy in a covered container in a fridge maintained between 0°C and 5°C.

When reheating, make sure it’s steaming hot throughout and only reheat once.

These recommendations are particularly important if you’ve made onion gravy using meat stock or meat cooking juices.

What Can You Serve With Homemade Onion Gravy?

Homemade onion gravy is incredibly versatile.

Here are ten delicious serving ideas.

1. Sausages and Mash

One of the best combinations. Serve with creamy mashed potatoes and your favourite sausages.

2. Sunday Roast Dinner

Pour onion gravy over roast potatoes, vegetables and your chosen roast.

3. Yorkshire Puddings

Serve hot Yorkshire puddings with a generous helping of onion gravy.

4. Homemade Cottage Pie

Use onion gravy to add flavour to a savoury minced-beef filling.

5. Vegetarian Sausages

A fantastic option with vegetable-based sausages and mash.

6. Homemade Meatballs

Serve meatballs in onion gravy with mashed potatoes.

7. Roast Chicken

Onion gravy makes a delicious alternative to ordinary chicken gravy.

8. Vegetable Pie

A rich accompaniment to homemade vegetable and mushroom pies.

9. Roasted Root Vegetables

Try it with homegrown carrots, parsnips and potatoes.

10. Toad in the Hole

One of my favourite traditional British meal combinations is sausages baked in Yorkshire pudding batter and served with rich onion gravy.

How to Make Onion Gravy More Flavourful

If you want to experiment, there are several ways to add extra flavour.

Add Fresh Thyme

Thyme works beautifully with caramelised onions.

If you grow herbs on the allotment, it’s a great opportunity to use them.

Add Rosemary

A small amount of fresh rosemary gives the gravy a lovely savoury flavour.

Use it sparingly because it can be quite strong.

Add Wholegrain Mustard

A teaspoon of wholegrain mustard can give onion gravy a delicious tangy flavour.

Use Mushroom Stock

Mushroom stock can provide a deeper savoury flavour for vegetarian gravy.

Add Balsamic Vinegar

A small amount helps balance the sweetness of the caramelised onions.

Avoid adding too much because it can overpower the gravy.

Common Mistakes When Making Onion Gravy

There are several mistakes worth avoiding.

1. Not cooking onions long enough: They need time to become soft and golden.
2. Using excessive heat: Burned onions can make the gravy bitter.
3. Adding flour without cooking it: This can produce a raw flour taste.
4. Pouring in all the stock too quickly: Gradual mixing helps prevent lumps.
5. Adding too much salt: Stock and sauces may already be salty.
6. Making the gravy too thick: Add a little extra stock or water.
7. Not allowing the gravy to simmer: Simmering helps develop flavour and thicken the sauce.
8. Using rotten onions: Always choose sound, healthy bulbs.
9. Leaving cooked gravy out too long: Refrigerate promptly.
10. Reheating leftovers repeatedly: Follow safe food-handling recommendations.

Frequently Asked Questions About Homemade Onion Gravy

What is the best onion for homemade onion gravy?

Yellow or brown onions are an excellent choice because they caramelise well and develop a rich, sweet flavour.

How do you make onion gravy from scratch?

Slowly cook sliced onions until caramelised, stir in flour, gradually add stock and seasonings, then simmer until thickened.

Can you make onion gravy without beef stock?

Yes. Vegetable stock works beautifully and makes the recipe suitable for vegetarians when all other ingredients are appropriate.

How do you make onion gravy thick?

Use a little plain flour or a cornflour slurry. Allow the gravy to simmer until it reaches your preferred consistency.

Can you make onion gravy without flour?

Yes. Cornflour can be used instead, or you can reduce the liquid to create a more concentrated sauce.

Can you freeze homemade onion gravy?

Yes. Cool it promptly, divide into portions and freeze in suitable containers. Use within around three months for best quality.

How long does homemade onion gravy last?

Store leftovers in the fridge and use within 48 hours, or freeze them promptly.

Why is my onion gravy too sweet?

The onions may have caramelised deeply, or too much sugar may have been added. A little balsamic vinegar can help balance the sweetness.

Why is my onion gravy bitter?

Burned onions, scorched garlic or excessively dark pan residue can produce bitterness.

Can you use red onions for gravy?

Absolutely. Red onions can create a delicious, slightly sweeter gravy with a darker colour.

Can you make onion gravy in advance?

Yes. Prepare it ahead of time, refrigerate promptly and reheat thoroughly before serving.

Is homemade onion gravy vegetarian?

It can be. Use vegetable stock and check that your Worcestershire sauce and other ingredients contain no animal-derived products.

Final Thoughts: Delicious Homemade Onion Gravy Using Your Own Harvest

Making a delicious homemade onion gravy recipe UK is a fantastic way to enjoy the onions you’ve grown in your garden or allotment.

You don’t need expensive ingredients or complicated cooking equipment.

With a few fresh onions, some stock, butter, flour and herbs, you can create a rich, comforting gravy that tastes wonderful with all sorts of meals.

My biggest tip is to take your time caramelising the onions.

That slow cooking develops their natural sweetness and creates the deep flavour that makes homemade onion gravy so delicious.

Whether you’re serving sausages and mash, a Sunday roast, vegetarian sausages or a homemade pie, this recipe is well worth trying.

And if you’ve grown plenty of onions this year, why not make a larger batch and freeze a few portions for another day?

It’s another brilliant way to make the most of everything you’ve grown.

Thanks for joining me here at Gardening with Ben. I hope you enjoy making your own delicious onion gravy.

Keep smiling, keep shining, keep gardening with Ben!