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.
5,848 4/5 (4 reviews)
Grade this page:
Keywords for this post:SauceMethodPrincipleExplanationStarchTemperatureRouxConsistencyBéchamel
Last modified on: August 27th 2024
For this post: Comment Follow Send to a friend
The (small) miracle of béchamel sauce

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
Should potatoes be washed twice?
Should potatoes be washed twice?
Let's say you have to make a recipe that includes potatoes, let's say sliced, you'll most likely proceed as follows: Peel the potatoes, wash them, slice them, wash them again, pat them dry and add them to your recipe. But there's a "but": depending on the recipe, the second washing may be a bad...
May 19th 20251,740 15
Grilled bacon is much better in the oven
Grilled bacon is much better in the oven
Some recipes call for thin slices of bacon to be cooked and added to the recipe, or to prepare one of those delicious breakfasts known as "à l'Anglaise".
April 25th 20251,7955
The thermometer is your friend
The thermometer is your friend
There are many recipes or foods that require a (very) precise cooking temperature: foie gras, sugar for caramel, meats and fish, and not forgetting pastries. For these few examples, getting the cooking temperature wrong can spoil the whole recipe or dish: undercooked, it's no good or misses the...
April 10th 20252,0955
Travel cakes
Travel cakes
You may have come across the term "travel cakes" ("gateaux de voyage" in french) for certain pastries, so let's take a look at what they're all about.
January 27th 20253,563
The aromatic power of sugar
The aromatic power of sugar
In the kitchen, sugar doesn't just sweeten, it also has an exceptional ability to capture flavors. Combined with aromatic ingredients, such as citrus zest, it acts as a veritable sponge for aromas. By taking the time to let the sugar soak up the flavors, you can transform your desserts, making...
December 25th 20244,0075

Other pages you may also like
What is the difference between bakery and patisserie?
What is the difference between bakery and patisserie?
This is a question that you may well have asked yourself and which I will attempt to answer. In France the two trades of "boulangerie" (bakery) and "pâtisserie" (patisserie and confectionery) have always been quite distinct, but where exactly do the boundaries lie? .
February 7th 2017128 K 14.1
Kitchen ovens
Kitchen ovens
You certainly have one in your kitchen, an oven, the essential tool for all kinds of cooking, whether in the kitchen of course, but also in pastry, bakery, pizza, and many others. Here is some information on its structure and operation.
May 16th 202029 K4.4
Unmoulding cakes while hot
Unmoulding cakes while hot
When you make a cake, pound cake or whatever (what bakers call a "travel cake" because it's easy to carry around) you've most likely made a batter, either by hand or in a food processor, which you then pour into a buttered pan. It's a classic, and I've already talked to you about 2 or 3 tips on...
February 6th 202135 K4.6
The "pith" of the cauliflower
The "pith" of the cauliflower
When using cauliflower in a recipe, there is a lot of preparation work at the beginning: removing the leaves, taking the tops or florets, etc. It's a bit tedious, but in the end you're left with the best of the cauliflower, ready to be used in your recipe.
February 5th 202211 K4.9
The color of the bread crumb
The color of the bread crumb
When you go to buy bread, at your baker's, at the time of the choice, if you hesitate of course, you will undoubtedly be very sensitive to the color of the crust, and you will be right. The color of the crust, from golden, to sometimes very dark, deep brown almost black, depending on the maturity...
April 30th 202217 K4.6
Post a comment or question
Posted by:
I am not a leaving thing

Follow this page
If you are interested in this page, you can "follow" it, by entering your email address here. You will then receive a notification immediately each time the page is modified or a new comment is added. Please note that you will need to confirm this following.
I am not a leaving thing
Note: 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