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Dessert

Butter Scotch

A brittle made from brown sugar, molasses, vinegar, butter, and a touch of baking soda, flavored with vanilla or lemon.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Sugar and vanilla are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 35,032 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓

Butter Scotch

Ingredients

Directions

  1. In a saucepan, combine brown sugar, water, molasses, vinegar, and butter.

  2. Boil the mixture until it reaches a brittle stage.

  3. Just before removing from heat, stir in a little baking soda.

  4. Add vanilla or lemon for flavor.

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

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

  2. Sugar + molassestop 11% of all pairs
    Smell alikemoderate
    Cooked together9,225 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

    Shared aroma: guaiacol (smoky, sweet).

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

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

  5. Sugar + buttertop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

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

Brown sugar
Provides sweetness and the caramel flavor that defines the brittle.
Molasses
Adds depth, color and a deeper caramel flavor to the candy.
Baking soda
Reacts with the hot acidic syrup to release gas, making the brittle light and airy.
Vinegar
Adds acidity that helps prevent sugar from crystallizing and balances the sweetness.

The step that matters

Stirring in the baking soda just before removing from heat. Baking soda reacts vigorously with the acidic syrup, releasing carbon dioxide bubbles. Adding it at the right moment, just before removal from heat, traps those bubbles as the candy sets, giving a light, airy texture. Adding it too early lets the gas escape.

Swap the vanilla

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

  1. Vanillathe original
  2. Figfits about as well
  3. Raisinfits about as well
  4. Applefits about as well

Fit is the average pairing score against sugar, molasses, vinegar, butter. 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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