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Lemon Syrup

A citrus syrup made from lemon peel, sugar, simple syrup, citric acid, and water to a gallon.

From an old cookbook · modernised transcription
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Why it works: Sugar and syrup match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 5,842 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓

Lemon Syrup

Ingredients

Directions

  1. Grate the peel of the lemons and mix with the sugar.

  2. Add the hot simple syrup and shake thoroughly.

  3. Let the mixture cool, then add the lemon juice and citric acid solution.

  4. Add enough syrup to reach a total volume of 1 gallon.

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. Sugar + syruptop 6% of all pairs
    Smell alikestrong
    Cooked together5,842 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

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

  3. Lemon + syruptop 20% of all pairs
    Smell alikelow
    Cooked together2,235 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

Lemons
Supply the peel oils for aroma and the juice for acidity and bright flavor.
Sugar
Adds sweetness and helps draw oil from the grated lemon peel.
Citric acid
Adds sharp sourness to balance the sweetness of the syrup.

The step that matters

Let the mixture cool before adding the juice and citric acid. Lemon juice and citric acid are volatile and bright in flavor, and very hot syrup can dull their fresh aroma. Cooling first helps keep the citrus character clear in the finished syrup.

Swap the lemon

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

  1. Vanillafits better
  2. Raisinfits better
  3. Pearfits about as well
  4. Lemonthe original

Fit is the average pairing score against sugar, syrup. 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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