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Dessert

French Custard

A custard made with milk, lemon peel, sugar, flour, and eggs, thickened gently.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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French Custard

Why it works: Milk and flour are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 78,219 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

French Custard

Ingredients

Directions

Make the milk base

  1. Combine milk and lemon peel in a pot.

  2. Sweeten with sugar and bring to a boil.

  3. Remove from heat and let cool.

Thicken and serve

  1. In a bowl, mix the flour with enough milk to create a smooth paste.

  2. Add the flour mixture and beaten eggs to the cooled milk, stirring continuously.

  3. Heat the mixture on the stove until thickened, but do not let it boil.

  4. Pour into cups and serve.

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.

  1. Milk + flourtop 14% of all pairs
    Smell alikelow
    Cooked together78,219 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  3. Milk + lemontop 15% of all pairs
    Smell alikemoderate
    Cooked together19,053 recipes

    Shared aroma: 2-nonenal (fatty, green).

  4. Flour + eggtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Lemon + flourtop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Milk and flour barely smell alike, yet cooks put them together in 78,219 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

Flour
Thickens the custard as its starch swells in the heated milk, giving it body.
Eggs
Add richness and help set the custard as the proteins coagulate when heated.
Milk
Forms the liquid base that the flour and eggs thicken into a custard.
White sugar
Sweetens the custard and balances the flavour of the milk.

The step that matters

Heat the mixture on the stove until thickened, but do not let it boil. Egg proteins set as they warm, but if the custard boils they can curdle and turn grainy, so gentle heat and constant stirring keep it smooth.

Swap the lemon

How well each one fits the dish's main ingredients (milk, sugar, flour, egg):

  1. Vanillafits better
  2. Raisinfits better
  3. Figfits better
  4. Lemonthe original

Fit is the average pairing score against milk, sugar, flour, egg. Candidates are from the same food group and used in at least 100 recipes.

“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.

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