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Dessert

Acid Drops

Acid Drops are small candies made from sugar, water, vinegar, lemon essence, and tartaric acid.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 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 ↓

Acid Drops

Ingredients

Directions

Make the syrup

  1. In a saucepan, combine the sugar, water, and vinegar.

  2. Boil the mixture until it snaps like glass.

Flavour and shape

  1. Add a few drops of lemon essence and the tartaric acid, and mix well.

  2. Pour the mixture out and cut it into small bullets.

  3. Flatten each bullet with your thumb and finger.

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

Loaf sugar
Forms the bulk of the candy and sets hard as the syrup cools.
Vinegar
Adds a small amount of acidity and helps keep the sugar from crystallising.
Tartaric acid
Provides the sharp, sour taste that defines an acid drop.

The step that matters

Boiling until it snaps like glass. Boiling drives off water and concentrates the sugar until it reaches the hard-crack stage. If it is undercooked the candy stays soft and sticky; if overcooked it can turn bitter or brittle. Judging the snap in cold water or by feel is how a cook knows the sugar is ready.

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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