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Moka Custard for Eclair Filling

A coffee-flavored custard used as filling for éclairs.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Milk and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓

Moka Custard for Eclair Filling

Ingredients

Directions

Make the custard

  1. In a saucepan, bring the milk and sugar to a boil.

  2. Mix the cornflour with a little cold milk, then pour the boiling milk over it and mix thoroughly.

  3. Return the mixture to the saucepan and let it boil for a few minutes.

  4. Add the coffee and vanilla essences along with the butter.

  5. Stir in the egg yolks and continue stirring until the mixture thickens.

Cool

  1. Pour the custard into a bowl and let it cool.

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.

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 + vanillatop 5% of all pairs
    Smell alikemoderate
    Cooked together19,187 recipes

    Shared aroma: ethyl caproate (fruity, apple peel).

  2. Milk + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  3. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

    Shared aroma: beta-damascenone (apple, rose).

  4. Coffee + vanillatop 9% of all pairs
    Smell alikemoderate
    Cooked together1,391 recipes

    Shared aroma: sotolon (curry, maple).

  5. Milk + coffeetop 10% of all pairs
    Smell alikemoderate
    Cooked together2,202 recipes

    Shared aroma: 4-heptenal (creamy, biscuit).

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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

Egg yolks
Thicken the custard as they set with heat, and add richness.
Cornflour
Thickens the milk into a smooth custard when heated.
Butter
Adds fat for a smooth, rich mouthfeel.
Sugar
Adds sweetness and balances the coffee flavour.
Milk
Forms the liquid base that the custard thickens.

The step that matters

Stir in the egg yolks and keep stirring until the mixture thickens. Egg yolks can scramble if the custard is too hot or stirred too little. Constant stirring spreads the heat evenly so the yolk proteins set into a smooth custard rather than lumps.

“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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