Name: Bechamel Sauce
Ingredients: 1 heaping tablespoon butter; 1 heaping tablespoon flour; ½ cup stock; ½ cup milk; 2 egg yolks

Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Bechamel Sauce

Ingredients

Directions

Make the sauce

Melt the butter in a saucepan.
Whisk in the flour until smooth.
Add the stock and milk, and cook until it boils, stirring constantly.
Remove from heat and let cool slightly.

Finish and serve

Stir in the well-beaten egg yolks.
Heat gently without boiling before serving.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Photo for illustrative purposes only · Contact us to use it

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

Butter + milktop 7% of all pairs

Smell alikemoderate

Cooked together81,283 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Butter + flourtop 12% of all pairs

Smell alikelow

Cooked together124,287 recipes

Shared aroma: isobutyraldehyde (malty, green).
Flour + milktop 14% of all pairs

Smell alikelow

Cooked together78,219 recipes

Shared aroma: isobutyraldehyde (malty, green).
Flour + eggtop 15% of all pairs

Smell alikelow

Cooked together106,462 recipes

Shared aroma: isobutyraldehyde (malty, green).
Butter + eggtop 17% of all pairs

Smell alikemoderate

Cooked together118,967 recipes

Shared aroma: decanal (soap, orange peel).

Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Butter: Enriches the sauce and carries flavor while forming the base with flour.
Flour: Thickens the liquid into a smooth sauce when cooked with the butter and liquid.
Stock: Supplies the main liquid and savory flavor of the sauce.
Milk: Adds creaminess and body to the sauce as it thickens.
Egg yolks: Add richness and further thicken the sauce when gently heated.

The step that matters

Stir in the egg yolks off the heat, then heat gently without boiling. Egg yolks begin to thicken around 160°F and can scramble or curdle if the sauce boils, leaving a grainy texture. Letting the sauce cool slightly first and heating gently keeps it smooth and silky.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.