White Sauce Recipe: Foolproof Béchamel in 10 Minutes

A lumpy white sauce can ruin an otherwise perfect lasagne. But silky béchamel requires only three ingredients, one foolproof ratio, and 15 minutes. This guide walks through the BBC-recommended technique for guaranteed smooth results, plus a chef-approved shortcut if you’re short on time.

Classic Ratio: 50g butter, 50g flour, 500ml milk ·
Prep Time: 10 minutes ·
Key Ingredients: Butter, flour, milk ·
Common Use: Lasagne, pasta, fish ·
Variations: Cornflour, cheese, cream

The table below consolidates verified parameters from BBC Good Food and Stefan Gourmet for quick reference.

How to make a basic white sauce?

BBC Good Food’s video presenter Emma Lewis walks through the classic technique, which is the standard taught in French cooking schools. The method follows the traditional roux approach: melt butter, whisk in flour, then gradually add milk while stirring constantly.

Ingredients for basic version

• 50g unsalted butter
• 50g plain flour
• 500ml whole milk
• Salt and white pepper to taste

Step-by-step method

1. Melt butter in a medium saucepan over medium heat until foaming.
2. Add flour all at once and whisk vigorously to form a smooth paste (the roux).
3. Cook the roux for about 1 minute to remove the raw flour taste.
4. Heat milk separately until steaming (small bubbles around the edge).
5. Add milk to the roux a little at a time, whisking constantly to prevent lumps.
6. Bring the mixture to a gentle boil, stirring continuously.
7. Reduce heat and simmer for 5–10 minutes until the sauce coats a spoon.
8. Season with salt and white pepper.

If lumps form, BBC Good Food advises using a whisk to break them apart — the sauce is forgiving. Cover the finished sauce with plastic wrap pressed directly onto the surface to prevent a skin forming.

Tips for smooth texture

If lumps form, a whisk can be used to remove them. Cover the finished sauce with plastic wrap pressed directly onto the surface to prevent a skin forming.

What are the three ingredients in white sauce?

White sauce — known as béchamel in France or besciamella in Italy — is made using only three core ingredients: milk, butter, and flour. That’s it. No thickeners, no cream, no shortcuts required for the classic version.

Butter

Unsalted butter is preferred so you can control the seasoning. The butter provides fat content and forms the foundation of the roux that thickens the sauce.

Flour

Plain flour (all-purpose) works perfectly. It combines with the butter to create a roux, which is the thickening agent. BBC Good Food specifies equal amounts of butter and flour by weight.

Milk

Whole milk is the standard, though the method works with any variety. The milk ratio is fixed: for every 500ml of milk, use 50g butter and 50g flour — this 1:1:10 ratio is verified across multiple sources.

What is the ratio of butter flour and milk for white sauce?

The golden ratio for white sauce is 1:1:10 by weight — equal parts butter and flour, with ten parts milk. BBC Good Food and Stefan Gourmet both confirm this proportions: 50g butter and 50g flour thicken 500ml of milk. The weight of butter and flour should be 10% of the milk volume.

Classic 1:1:10 ratio

BBC Good Food recommends using equal amounts of butter and flour for the roux. The roux should be cooked for just under a minute according to the BBC video. Stefan Gourmet’s method confirms the 10% principle: for 250ml (1 cup) of milk, use 25g of flour and 25g of butter; for 500ml (2 cups), use 50g of each; for 1 litre (4 cups), use 100g of each.

Scaling for 300ml

For 300ml of milk, apply the 10% ratio: 30g butter and 30g flour. Heat milk first until small bubbles are visible around the edge reduces stirring time after adding milk to the roux.

“The sauce is ready when a wooden spoon coated with sauce shows a trail when a finger is run down it.”

— Emma Lewis, BBC Good Food video presenter

How does Gordon Ramsay make white sauce?

Gordon Ramsay’s white sauce technique centres on the Mornay variation — adding cheese off the heat to create a richer sauce. His approach follows the same basic roux method but emphasizes continuous stirring and proper seasoning.

Ramsay’s cheese version

Cheese (such as cheddar or blue cheese) can be added to make a mornay sauce. A handful of grated cheese is approximately 25 to 50 grams. Mustard and herbs can be added to white sauce for flavour variation.

Key technique differences

BBC Good Food YouTube demonstrates the classic approach: milk should be added a little at a time while stirring vigorously to prevent lumps. The sauce should be cooked for about 5 minutes until it thickens and bubbles. The mixture should be brought to the boil and cooked for a couple of minutes until glossy.

“Cheese can be added off the heat to make a cheese sauce.”

— BBC Good Food technique video

White sauce recipe variations

Beyond the classic béchamel, several variations adapt the base recipe for different textures, flavours, and dietary needs. BBC Good Food recipe includes optional infusion with onion, bay leaf, and cloves for 20 minutes — the infusion process adds depth of flavour to the sauce but is optional.

For pasta and lasagne

White sauce serves as the creamy binding layer in lasagne. The sauce should be cooked for 5-10 minutes, stirring continuously, until thickened. A white roux is required for white sauce, while a brown roux is used for other applications.

With cornflour

Cornflour paste replaces roux in the quick-thickening method. Stefan Gourmet confirms that cornflour can be mixed with cold milk directly — a simpler approach that bypasses the roux entirely.

For fish or chicken

A plain béchamel works well as a mild sauce base for fish or chicken dishes. Adding cheese creates Mornay sauce, ideal for pasta and gratins.

Sweet or cream versions

While not covered in the verified sources, cream can be substituted for milk in some preparations for a richer result.

What is béchamel sauce?

Béchamel is one of the classic French sauces taught in French cooking schools. White sauce is known as béchamel in France or besciamella in Italy and is an important basic sauce used in many dishes like lasagna.

How to thicken white sauce?

Thickening white sauce depends on the roux method: butter and flour form a paste that absorbs liquid as it cooks. The roux should be cooked over medium heat for about a minute to cook out the flour. If the sauce is too thin, continue simmering while stirring — the starch absorbs more liquid as it cooks longer.

Can white sauce be made with cream?

While the classic recipe uses milk, cream can be incorporated for a richer result. This variation falls outside the verified sources, so specific ratios are not confirmed.

Is white sauce suitable for fish?

Plain béchamel provides a neutral, creamy coating ideal for fish dishes. Its mild flavour complements rather than overwhelms delicate fish.

How to make 300ml white sauce?

For 300ml of white sauce, use 30g butter, 30g plain flour, and 300ml milk. Follow the same method: melt butter, whisk in flour, cook roux for 1 minute, heat milk separately, then combine gradually while stirring. Simmer until the sauce coats a spoon.

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This foolproof béchamel shines in lasagne, much like the white sauce for lasagne that delivers easy UK tips for that creamy layer.

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