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Dessert

Citronized Milk Jelly

A dessert made by boiling milk, sugar, gelatin, and lemon rind, then adding lemon juice to curdle the milk and setting the mixture.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Milk and lemon are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 19,053 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Citronized Milk Jelly

Ingredients

Directions

Make the mixture

  1. Boil the milk, sugar, and gelatin together with some thinly cut lemon rind.

  2. Pour the mixture into a basin to cool.

Curdle and set

  1. Add the lemon juice and stir until the milk curdles.

  2. Pour into a mold and let the jelly set.

  3. When turned out, the casein will be at the base and the jelly on top.

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

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

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

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

  3. Milk + sugartop 18% of all pairs
    Smell alikelow
    Cooked together77,875 recipes

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

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

Milk
Curdles when lemon juice is added, separating into curds and whey.
Gelatine
Sets the liquid into a firm jelly as it cools.
Powdered sugar
Adds sweetness to balance the sharpness of the lemon.
Lemons
Juice curdles the milk, and the rind adds lemon aroma and flavour.

The step that matters

Adding the lemon juice. The acid in lemon juice makes the milk protein casein clump together into curds. Stir only until the milk curdles, because the curds are what separate from the liquid and give the jelly its layered result.

Swap the lemon

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

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

Fit is the average pairing score against milk, sugar. 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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