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Roman Punch

A chilled punch made with rum, lemon rind, lemon juice, boiling water, sugar, optional oranges, and egg whites.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Roman Punch

Why it works: Lemon and orange match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 10,634 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓

Roman Punch

Ingredients

Directions

Prepare

  1. Rub the rind of several lemons onto loose sugar.

  2. Squeeze the juice of 12 lemons and add it to 1 quart of boiling water with 2 pounds of sugar dissolved.

  3. Optionally add 1–2 oranges.

Finish

  1. When the mixture is partly frozen, beat in the whites of several eggs until frothy.

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. Lemon + orangetop 1% of all pairs
    Smell alikestrong
    Cooked together10,634 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  2. Rum + orangetop 12% of all pairs
    Smell alikemoderate
    Cooked together801 recipes

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

  3. Rum + sugartop 14% of all pairs
    Smell alikelow
    Cooked together2,908 recipes

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

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

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

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

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

Lemon and sugar 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 whites
Whipped into the partly frozen mixture to add a light, frothy texture.
Sugar
Sweetens the punch and balances the sharp acidity of the lemon juice.
Lemons
Supply the acidity and aromatic oils from the rind that define the punch's flavor.
Rum
Adds alcoholic body and flavor; it also keeps the mixture from freezing solid.

The step that matters

Beating in the egg whites when partly frozen. Egg whites whip to a stable foam only when cold and not fully frozen; beating too early or too late gives a thin or icy result rather than a light froth.

Swap the orange

The recipe marks orange as optional. How well each one fits the dish's main ingredients (rum, lemon, sugar, egg):

  1. Vanillafits better
  2. Orangethe original
  3. Pineapplefits about as well
  4. Limefits less well

Fit is the average pairing score against rum, 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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