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Dessert

Toffee

Toffee is a sweet confection made by boiling sugar, syrup, and water, then adding butter and lemon essence.

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 ↓

Toffee

Ingredients

Directions

Make the toffee

  1. In a saucepan, combine sugar, syrup, and water.

  2. Boil for about 20 minutes.

  3. Add butter and continue boiling until it hardens when dropped in cold water.

  4. Stir in essence of lemon just before pouring.

Pour

  1. Pour into a buttered tin.

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

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

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

    Shared aroma: guaiacol (smoky, sweet).

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

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

  5. Syrup + lemontop 20% of all pairs
    Smell alikelow
    Cooked together2,235 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

Sugar
Forms the sweet base and sets into a brittle, hard candy as the syrup cooks down.
Syrup
Interferes with sugar crystallisation, keeping the toffee smooth rather than grainy.
Butter
Adds fat for a richer flavour and a softer, less brittle bite.

The step that matters

Boiling until it hardens in cold water. Toffee sets by concentrating sugar as water boils off. Stop too early and it stays sticky; go too far and it turns bitter or scorches. Testing a drop in cold water shows when the sugar has reached the hard-crack stage.

Swap the lemon

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

  1. Vanillafits better
  2. Peachfits about as well
  3. Apricotfits about as well
  4. Lemonthe original

Fit is the average pairing score against sugar, syrup, 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.

More toffee recipes

Everton 28Russian 17Almond 16Treacle 8Coconut 6Vanilla 5 See all 36 →

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