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Lemon Syrup

A clear syrup made from water, sugar, citric acid, and lemon oil.

From an old cookbook · modernised transcription
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Why it works: Sugar and lemon are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Lemon Syrup

Ingredients

Directions

Prepare the syrup

  1. Dissolve the citric acid in warm water.

  2. Mix the dissolved acid with the sugar and water.

  3. Do not use a brass kettle.

Cool and bottle

  1. Allow the mixture to cool completely.

  2. Add the lemon oil and bottle the syrup.

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 + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 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

Citric acid
Provides the sour, tart edge that balances the sweetness.
Loaf sugar
Sweetens the syrup and gives it body.
Lemon oil
Adds concentrated lemon aroma and flavour.

The step that matters

Do not use a brass kettle. Citric acid is acidic and can react with brass, which can leach metal into the syrup and alter its flavour and colour. Use a non-reactive vessel instead.

“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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