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Dessert

Butter-scotch Squares

A caramel candy made from brown sugar, glucose, butter, salt, and lemon oil, cooked to a hard crack stage.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and lemon are a kitchen classic. They rank in the top 16% of all ingredient pairs, and cooks put them together in 41,227 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓

Butter-scotch Squares

Ingredients

Directions

Make the candy

  1. Dissolve the light brown sugar and glucose in water.

  2. Cook the mixture to 280°F (138°C).

  3. Add the butter and salt, then continue cooking to 290°F (143°C).

  4. Remove from heat and stir in the oil of lemon.

Set and store

  1. Pour the mixture between iron bars on a greased slab.

  2. Mark with a caramel cutter, let cool, then break into pieces.

  3. Store in jars or pans.

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. Butter + lemontop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

    Shared aroma: 3-hexenal (apple, fruity).

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

    Shared aroma: guaiacol (smoky, sweet).

  3. 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

Light brown sugar
Provides the bulk of the sweetness and the molasses flavour of the candy.
Glucose
Inhibits crystallisation so the candy sets smooth and brittle rather than grainy.
Butter
Adds fat for a richer mouthfeel and a softer, buttery flavour.

The step that matters

Cooking to 290°F (143°C). Sugar syrup must reach the target temperature to set hard when cooled. Undercooking leaves it sticky, while overcooking can scorch it and make it bitter.

Swap the lemon

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

  1. Vanillafits better
  2. Figfits better
  3. Peachfits better
  4. Lemonthe original

Fit is the average pairing score against sugar, 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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