Name: Lemon Sauce
Ingredients: 1½ cups sugar; ¾ cup butter; 1 egg; 1 lemon (grated rind and juice); 1 teaspoon flour; 1 cup boiling water

Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Lemon Sauce

Ingredients

Directions

In a bowl, mix the sugar and butter until well combined.
Add the egg and mix thoroughly.
Stir the flour into the boiling water until dissolved.
Combine the flour mixture with the sugar and butter mixture.
Finally, add the grated rind and juice of the lemon and mix well.

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 + flourtop 12% of all pairs

Smell alikelow

Cooked together124,287 recipes

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

Smell alikemoderate

Cooked together92,116 recipes

Shared aroma: phenylacetaldehyde (hawthorne, honey).
Egg + flourtop 15% of all pairs

Smell alikelow

Cooked together106,462 recipes

Shared aroma: isobutyraldehyde (malty, green).
Butter + lemontop 16% of all pairs

Smell alikemoderate

Cooked together41,227 recipes

Shared aroma: 3-hexenal (apple, fruity).
Lemon + flourtop 17% of all pairs

Smell alikemoderate

Cooked together30,404 recipes

Shared aroma: isobutyraldehyde (malty, green).

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: Adds richness and fat, giving the sauce a smooth, rounded mouthfeel.
Egg: Adds richness and helps bind the sauce as it is combined with the other ingredients.
Flour: Thickens the liquid as it is dissolved in boiling water, giving the sauce body.
Lemon: Provides acidity and aroma from the rind and juice, brightening the sweetness.