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Dessert

Toffee, Treacle

A sweet confection made by boiling treacle, brown sugar, and butter with vinegar, bicarbonate, and almond essence until it hardens into bars.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and almond are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 9,245 recipes. Both carry 2,3-pentanedione, which smells butter, sweet. The science ↓

Toffee, Treacle

Ingredients

Directions

Make the toffee

  1. In a saucepan, combine the brown sugar and vinegar, and heat until dissolved.

  2. Add the treacle and boil until it reaches 247°F (large ball stage).

  3. Remove from heat, then stir in the bicarbonate of soda dissolved in a little hot water, the butter, and almond essence.

  4. Boil again until it reaches 290°F (small crack stage).

Set and serve

  1. Pour the mixture into a greased tin.

  2. When partially set, mark into bars or squares, then break into sections when fully firm.

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 + almondtop 11% of all pairs
    Smell alikemoderate
    Cooked together9,245 recipes

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

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

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

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

    Shared aroma: guaiacol (smoky, sweet).

  4. Sugar + almondtop 18% of all pairs
    Smell alikemoderate
    Cooked together15,679 recipes

    Shared aroma: 1-penten-3-one (fish, pungent).

  5. Butter + vinegartop 23% of all pairs
    Smell alikemoderate
    Cooked together13,513 recipes

    Shared aroma: isoamyl acetate (banana, pear).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Treacle
Provides the dark colour, rich flavour and chewy body of the toffee.
Brown sugar
Adds sweetness and helps the mixture dissolve and caramelise as it cooks.
Vinegar
Adds acidity that works with the bicarbonate of soda and softens the sugar crystals.
Bicarbonate of soda
Reacts with the acid to release gas, making the toffee lighter and less dense.
Butter
Adds fat for a smoother texture and a richer mouthfeel.

The step that matters

Boil again until it reaches 290°F (small crack stage). The sugar concentration rises as water boils off, so the final temperature sets the hardness. Going too far gives a bitter, burnt toffee, while stopping short leaves it soft and sticky.

Swap the almond

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

  1. Almondthe original
  2. Sesamefits about as well
  3. Soybeanfits about as well
  4. Peanutfits less well

Fit is the average pairing score against sugar, butter, 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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