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Dessert

Quince or Apple Custards

A custard made by boiling apple juice with sugar and lemon juice, then mixing with eggs and cooking in a water bath.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Apple and lemon are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 7,551 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Quince or Apple Custards

Ingredients

Directions

Make the custard base

  1. Combine apple juice, lemon juice, and sugar in a saucepan and bring to a boil.

  2. Quickly stir the boiling mixture into the well-beaten eggs in small portions.

Thicken and finish

  1. Thicken the custard by placing the jug in a pan of boiling water.

  2. For quince custards, follow the same steps but omit the lemon juice.

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. Apple + lemontop 14% of all pairs
    Smell alikemoderate
    Cooked together7,551 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Apple + sugartop 18% of all pairs
    Smell alikelow
    Cooked together16,478 recipes

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

  3. Lemon + sugartop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  4. Lemon + eggtop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

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

  5. Sugar + eggtop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

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

Apple and sugar barely smell alike, yet cooks put them together in 16,478 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

Eggs
Set and thicken the custard as they are gently heated, giving it body.
Sugar
Adds sweetness and balances the tartness of the juices.
Apple juice
Forms the liquid base and carries the fruit flavour through the custard.
Lemon juice
Adds acidity that brightens the flavour and balances the sweetness.

The step that matters

Adding the boiling mixture to the eggs. Egg proteins set when heated, so pouring the hot syrup in quickly and in small portions while stirring tempers the eggs gradually. Adding it all at once can scramble them into lumps instead of a smooth custard.

Swap the apple

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

  1. Orangefits better
  2. Vanillafits better
  3. Limefits better
  4. Applethe original

Fit is the average pairing score against lemon, sugar, 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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