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German Custard Sauce

A light custard sauce made with egg yolks, powdered sugar, lemon rind, sherry, and a pinch of salt.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Lemon and sherry are a kitchen classic. They rank in the top 17% of all ingredient pairs, and cooks put them together in 3,273 recipes. Both carry 1-octen-3-ol, which smells mushroom, earthy. The science ↓

German Custard Sauce

Ingredients

Directions

  1. In a saucepan, combine egg yolks, powdered sugar, lemon rind, sherry, and salt.

  2. Beat the mixture over low heat until it becomes a light, frothy custard.

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. Lemon + sherrytop 17% of all pairs
    Smell alikemoderate
    Cooked together3,273 recipes

    Shared aroma: 1-octen-3-ol (mushroom, earthy).

  2. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  3. Egg + lemontop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

  4. Egg + sugartop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

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

  5. Sugar + sherrytop 22% of all pairs
    Smell alikelow
    Cooked together4,141 recipes

    Shared aroma: guaiacol (smoky, sweet).

Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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
Proteins thicken into a custard as they gently heat, and they add richness.
Powdered sugar
Adds sweetness and dissolves smoothly into the yolks for a silky texture.
Sherry
Adds a fragrant, winey flavour that balances the richness of the yolks.
Lemon rind
Adds bright citrus aroma from the oils in the zest.

The step that matters

Beat over low heat. Egg yolk proteins set at gentle temperatures. Too much heat scrambles the yolks into lumps, so low heat and constant beating keep the custard smooth and thick.

Swap the lemon

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

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

Fit is the average pairing score against egg, sugar, sherry. 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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