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Peanut Butter Fudge

A sweet fudge made with 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

Make the fudge base

  1. Combine sugar, milk, peanut butter, and vanilla in a saucepan.

  2. Boil for 5 minutes.

Set and cut

  1. Remove from heat and beat until thickened.

  2. Pour onto a buttered platter and cut into squares.

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

Sugar
Provides sweetness and forms the crystal structure that gives fudge its firm, creamy body.
Milk
Adds moisture and richness, helping the sugar dissolve smoothly and keeping the fudge creamy.
Peanut butter
Contributes fat and roasted peanut flavour, softening the texture and adding body.

The step that matters

Beat until thickened. As the hot mixture cools and is beaten, sugar crystals form. Beating at the right moment yields fine crystals and a smooth, creamy fudge. Beating too early or too long can make it grainy or hard to pour.

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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