The (small) miracle of béchamel sauce


The (small) miracle of béchamel sauce
Making a béchamel sauce is going to confront you with a little miracle that happens every time: You pour milk over a roux, it's very liquid, you stir over a low heat, and then all of a sudden, miracle, the sauce sets, it thickens, you've got your béchamel.

Let's see what happened.
10 K 4/5 (4 reviews)
Grade this page:
Keywords for this post:SauceMethodPrincipleExplanationStarchTemperatureRouxConsistencyBéchamel
Last modified on: August 27th 2024
For this postComments Lasts posts Follow
For this post: Comment Follow Ask me a question Send to a friend

A basic sauce

louis bechameil

Béchamel is one of the staple sauces of French cuisine, found in a host of recipes. Its name comes from Louis Béchameil, who was maitre d'hôtel to Louis XIV.
Making it is quite simple: first a "roux" mixture of flour and butter, which is heated and colored (hence its name).

roux


Once the roux has reached the right color, cold milk is added, the mixture is very liquid, and you continue to cook and stir over low heat until it thickens (you'll find the full recipe here).
But why does it thicken? As you'd expect, there's no magic involved, just a little physics and chemistry.

Flour and starch

The secret lies in the roux's flour, which contains grains of starch, a complex sugar made up of glucose molecules rolled up into tiny little balls.

amidon

When the milk is added to the roux and heated, the temperature of the mixture gradually rises.
It's around 70°C that the magic happens: the grains of starch in the flour break up into smaller grains, starch molecules that begin to absorb the milk around them, up to 20 times their volume, thus increasing the sauce's viscosity.

This process, known as starch gelatinization, takes place between 70°C and 85°C, giving béchamel its characteristic thick, creamy consistency.
Note in passing that this process of starch gelatinization is also at work in, among other things, crème pâtissière or flan, where flour is often replaced by maïzena, a corn starch.

In short: Béchamel thickens because it contains flour that is heated, causing its starch grains to burst and absorb the milk around them.
So béchamel is not just a culinary classic, it's also a little chemistry lesson in action.
Lasts posts
How to Properly Fill a Jar
When you have a jar in your kitchen that’s almost empty—flour or almond flour, for example—you’ll probably refill it before it’s completely empty. And that’s a great way to go about it—no one wants to run out of an ingredient right in the middle of a recipe. Once you’ve...
October 2nd 20265235
Serving Temperature for Wine
When it comes to serving wine, you may (like me) have a fairly simple rule of thumb: red wine at room temperature, and white, rosé, and yellow wines in the fridge until it’s time to serve them. It’s very easy to remember, but it’s a bit simplistic, and you’ll see that there’s a much...
September 23th 20268435
Hot Emulsified Sauces
In French cuisine, sauces are a very important part of a recipe—not just a side dish. In fact, they’re so important that, especially since the time of Auguste Escoffier, they’ve been classified into categories. And among these categories are “hot emulsified sauces,” or lukewarm ones. ...
September 9th 20261,2745
Hot Dishes and Cold Dishes
When plating or serving a dish—whether hot or cold—on a plate, it’s very important to make sure they’re both the right temperature; in other words: if the dish is hot, the plate should be hot, and conversely, if the dish is cold, the plate should be cold. Is this really important? Let’s...
September 2nd 20261,0003
In baking, cold is your friend
When you bake at home—especially when making pie crusts—you’ve probably noticed that it’s quite difficult to work with the dough when it’s hot. It gets soft, is hard to roll out, and breaks or crumples very easily. And this doesn’t just happen when it’s hot—even in a comfortable...
August 26th 20261,0275
Other articles you might also like
The infinite variety of salads
Making a salad for a meal, a few ingredients of your choice and a sauce to bind it all together is still one of the best ways to cook something really good quickly and simply. And since there is often a "fresh" aspect with the vegetables in the ingredients, not only does it taste good, but it's...
March 13th 202112 K4.6
No need to boil gelatin
Gelatin is a magical ingredient for making light, creamy, structured desserts, yet it's often misused in the kitchen. A common mistake in some recipes is the idea that it needs to be boiled for it to work properly, but this is a mistake indeed: gelatin melts at a much lower temperature, around...
November 21th 202412 K5
Parsley stems
Parsley, whether curly or flat, is a delicious ingredient in many recipes, where it is used both raw and cooked. When used raw, in a salad for example, where it always provides, alone or with other herbs, a remarkable freshness, only the leaves are kept. And when used cooked?
July 28th 202512 K 13
The 3 kinds of meringue
Meringue – what could be simpler? Just beaten egg whites with sugar added. This makes a fairly stiff mixture which can then be cooked in a cool oven to create those lovely, light confections. But in the world of professional patisserie, meringue comes in three different kinds. Even if the...
June 14th 201368 K4.5
Is it really necessary to cream egg yolks?
Let’s try and answer a question that crops up in cookery and patisserie, even if it verges on the existential: do the egg yolks in a custard recipe really need to be beaten until pale, or not?
February 28th 201846 K4.3
Post a comment or question
Posted by
I am not a leaving thing
Follow this page

Receive an e-mail as soon as this page is modified or receives a new comment.

I am not a leaving thing
We'll never share your e-mail address with anyone else.
Alternatively: you can subscribe to the mailing list of cooling-ez.com , you will receive a e-mail for each new recipe published on the site.

Back to top of page