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Butter Scotch Bars

A hard candy bar made from dark brown sugar, glucose, cream, and lemon oil.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Sugar and cream are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 43,450 recipes. Both carry 2,3-butanedione, which smells butter, sweet. The science ↓

Butter Scotch Bars

Ingredients

Directions

Make the candy

  1. In a large pot, combine dark brown sugar, glucose, and enough water to dissolve the sugar.

  2. Cook the mixture over medium heat until it reaches 250°F (120°C).

  3. Add the cream and continue to stir and cook until it forms a very hard ball or reaches the first snap stage.

  4. Remove from heat and flavor with a little lemon oil.

Set and cut

  1. Pour the mixture onto a slab and let it cool completely.

  2. Once cooled, cut into 5‑inch bars and wrap each bar in heavy wax paper.

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 + creamtop 9% of all pairs
    Smell alikemoderate
    Cooked together43,450 recipes

    Shared aroma: 2,3-butanedione (butter, sweet).

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

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

  3. Cream + lemontop 30% of all pairs
    Smell alikelow
    Cooked together15,640 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

Dark brown sugar
Provides the bulk of the sweetness and the deep caramel flavor.
Glucose
Inhibits crystallisation, keeping the candy smooth rather than grainy.
Cream
Adds fat and richness, softening the candy's texture.
Paraffin substitute
Adds a waxy coating-style body and helps the bars set and hold their shape.

The step that matters

Cooking to the hard-ball or first snap stage. The candy sets firm only when enough water has boiled off. Undercooking leaves a soft, sticky bar, while overcooking makes it brittle or burnt-tasting. Adding cream late, while stirring, helps prevent scorching on the pot bottom.

Swap the lemon

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

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

Fit is the average pairing score against sugar, cream. 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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