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Dessert

Citron Preserves

Citron preserves are made by boiling citron with sugar, vinegar, and sliced lemons until syrupy.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Sugar and vinegar are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 20,806 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓

Citron Preserves

Ingredients

Directions

Macerate

  1. Combine 6 pounds of citron and 2 pounds of sugar in a bowl and let stand overnight.

Cook the preserves

  1. In the morning, strain the mixture and boil the juice in a pot until it becomes syrupy.

  2. Add the citron to the syrup and boil until it reaches your desired color.

  3. Stir in ½ cup of vinegar and the sliced lemons.

  4. Boil the mixture for an additional 2 hours.

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 + vinegartop 15% of all pairs
    Smell alikemoderate
    Cooked together20,806 recipes

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

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

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

  3. Vinegar + lemontop 20% of all pairs
    Smell alikemoderate
    Cooked together7,334 recipes

    Shared aroma: acetic acid (sour, vinegar).

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

Citron
Forms the bulk of the preserve, and its peel and pith soften and absorb the syrup as it cooks.
Sugar
Draws water out of the fruit and, as it concentrates, thickens the syrup and sweetens the preserve.
Vinegar
Adds acidity that brightens the flavor and balances the sweetness of the syrup.
Lemons
Add acidity and citrus aroma to the preserve.

The step that matters

Boiling the citron to your desired color. As water evaporates, the sugar concentration rises and the syrup thickens, so the fruit candies gradually. Stopping too early leaves the fruit wet and less stable, while boiling too long darkens the syrup and can caramelize the sugar, giving a bitter taste.

Swap the lemon

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

  1. Vanillafits better
  2. Strawberryfits better
  3. Pineapplefits better
  4. Lemonthe original

Fit is the average pairing score against sugar, vinegar. 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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