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Dessert

Divinity Fudge

A chocolate fudge made with sugar, boiling water, Karo syrup, vanilla, walnuts, and egg whites.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 ↓

Divinity Fudge

Ingredients

Directions

Make the syrup

  1. Mix the sugar, boiling water, and Karo syrup in a saucepan.

  2. Bring to a boil and cook until a soft ball forms in cold water.

Beat and set

  1. Remove from heat and stir in vanilla and walnuts.

  2. Beat the mixture until it thickens.

  3. Fold in the stiffly beaten egg whites and continue beating until it holds its shape.

  4. Drop spoonfuls onto buttered paper to cool.

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. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

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

  3. Vanilla + walnuttop 10% of all pairs
    Smell alikestrong
    Cooked together2,730 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  4. Syrup + vanillatop 12% of all pairs
    Smell alikelow
    Cooked together1,855 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  5. Walnut + meattop 13% of all pairs
    Smell alikemoderate
    Cooked together1,035 recipes

    Shared aroma: 2,4-decadienal (seaweed).

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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

Granulated sugar
Forms the sweet candy base that sets firm as it cools.
Karo syrup
Interferes with sugar crystallization, keeping the fudge smooth and tender.
Egg whites
Trap air when beaten, giving the candy a light, airy texture.
Walnut meats
Add crunch and nutty flavor that contrasts with the soft candy.

The step that matters

Cook to the soft ball stage. Sugar syrup must reach the right temperature to set correctly. Undercooked syrup stays sticky, while overcooked syrup turns hard and grainy as it cools.

Swap the walnut

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

  1. Chestnutfits better
  2. Almondfits better
  3. Pecansfits about as well
  4. Walnutthe original

Fit is the average pairing score against sugar, syrup, vanilla, meat, egg. 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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