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Dessert

Soft Toffee

Soft toffee made from melted butter, condensed milk, sugar, milk or cream, and flavoring.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Soft Toffee

Ingredients

Directions

  1. Melt the butter in a saucepan.

  2. Add the condensed milk, sugar, and milk (or cream).

  3. Boil the mixture and let it continue boiling for 25 minutes.

  4. Stir in the flavoring and pour into a greased 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. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  2. Sugar + condensed milktop 11% of all pairs
    Smell alikemoderate
    Cooked together804 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

    Shared aroma: guaiacol (smoky, sweet).

  4. Sugar + milktop 18% of all pairs
    Smell alikelow
    Cooked together77,875 recipes

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

  5. Condensed milk + buttertop 27% of all pairs
    Smell alikelow
    Cooked together711 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

Sugar and milk barely smell alike, yet cooks put them together in 77,875 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
Sweetens the toffee and, as it boils down, sets the final texture.
Condensed milk
Adds sweetness and milk solids that brown during cooking for a rich, chewy toffee.
Butter
Adds fat for richness and a smooth, tender bite.
Milk or cream
Adds moisture and dairy richness, keeping the toffee softer.

The step that matters

Boiling for the full 25 minutes. As water evaporates, the sugar concentration rises, so the final texture depends on how far the mixture is cooked. Too little boiling leaves the toffee soft and sticky, while too much makes it hard.

“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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