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Peanut Butter Fudge

A sweet fudge made with brown sugar, milk, peanut butter, and vanilla.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Milk and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓

Peanut Butter Fudge

Ingredients

Directions

  1. Boil milk and brown sugar until it forms a soft ball in cold water.

  2. Add peanut butter and stir until it begins to thicken.

  3. Add vanilla and spread the mixture 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. Milk + vanillatop 5% of all pairs
    Smell alikemoderate
    Cooked together19,187 recipes

    Shared aroma: ethyl caproate (fruity, apple peel).

  2. Milk + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

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

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

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

  4. Peanut + vanillatop 10% of all pairs
    Smell alikestrong
    Cooked together1,176 recipes

    Shared aroma: guaiacol (smoky, sweet).

  5. Milk + peanuttop 14% of all pairs
    Smell alikemoderate
    Cooked together1,048 recipes

    Shared aroma: 2-undecenal (sweet).

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

Brown sugar
Provides sweetness and, as it cooks, the sugar structure that sets the fudge's texture.
Milk
Adds moisture and milk solids that soften the sugar crystals for a smoother, creamier texture.
Peanut butter
Adds fat and flavor, making the fudge rich and creamy while it thickens.
Vanilla
Adds aroma that rounds out the sweetness and peanut flavor.

The step that matters

Boil to the soft-ball stage. Boiling concentrates the sugar to a set point. Stopping short leaves the fudge soft and runny, while going too far makes it hard and grainy as it cools.

Swap the peanut

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

  1. Almondfits better
  2. Cocoafits better
  3. Chestnutfits better
  4. Peanutthe original

Fit is the average pairing score against sugar, milk, butter, vanilla. 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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