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Dessert

Butterscotch Candy

A hard candy made from sugar, Karo syrup, vinegar, butter, and vanilla.

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

Butterscotch Candy

Ingredients

Directions

Make the candy

  1. In a saucepan, combine sugar, Karo syrup, vinegar, and butter.

  2. Boil the mixture until a drop in cold water becomes hard.

  3. Remove from heat and stir in vanilla.

Set and cut

  1. Pour the mixture onto a buttered baking sheet.

  2. Once cool, cut into squares.

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. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

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

  3. Syrup + vanillatop 12% of all pairs
    Smell alikelow
    Cooked together1,855 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  4. Butter + vanillatop 14% of all pairs
    Smell alikemoderate
    Cooked together20,050 recipes

    Shared aroma: guaiacol (smoky, sweet).

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

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

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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

Sugar
Forms the brittle, crisp candy structure as the syrup cooks and hardens.
Karo syrup
Keeps the sugar from crystallising, giving a smooth, glassy texture.
Butter
Adds richness and a soft buttery flavour to the candy.
Vinegar
A small amount of acid that helps prevent sugar crystallisation and softens sweetness.

The step that matters

Boiling to the hard-crack stage. The candy sets hard only if the syrup is cooked long enough to drive off enough water. Undercooked syrup stays sticky, while overcooked syrup turns bitter and can scorch. Testing a drop in cold water shows when it has reached the right concentration.

“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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