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Dessert

Chocolate Bars

A homemade chocolate bar with butter, sugar, eggs, flour, chocolate, and walnuts baked into a sticky bar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Chocolate and walnut are a kitchen classic. They rank in the top 10% of all ingredient pairs, and cooks put them together in 1,548 recipes. Both carry 3-ethyl-2,5-dimethylpyrazine, which smells roasted, nutty. The science ↓

Chocolate Bars

Oven, in the book's wordsA very slow oven

Ingredients

Directions

The book says “a very slow oven”. The 300°F (150°C) in the steps is the modern equivalent, not the book's own figure.

Make the batter

  1. Cream the butter and sugar together.

  2. Add the beaten eggs and mix well.

  3. Gradually add the flour and mix until combined.

  4. Melt the chocolate and stir it into the mixture.

  5. Fold in the chopped walnuts.

Bake and serve

  1. Spread the mixture about ½ inch thick in a buttered baking tin.

  2. Bake in a slow oven at 300°F (150°C) for 45 minutes.

  3. The bars should be slightly sticky when first baked.

  4. Cut into bars after cooling.

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. Chocolate + walnuttop 10% of all pairs
    Smell alikemoderate
    Cooked together1,548 recipes

    Shared aroma: 3-ethyl-2,5-dimethylpyrazine (roasted, nutty).

  2. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  3. Flour + walnuttop 12% of all pairs
    Smell alikemoderate
    Cooked together5,873 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Sugar + chocolatetop 13% of all pairs
    Smell alikemoderate
    Cooked together15,404 recipes

    Shared aroma: guaiacol (smoky, sweet).

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

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

Butter and flour barely smell alike, yet cooks put them together in 124,287 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

Butter
Creamed with sugar to trap air and add richness and tender texture.
Eggs
Bind the batter and add moisture and structure as they set in the oven.
Pastry flour
Provides the structure that holds the bars together after baking.
Chocolate
Adds deep flavour and fat, giving the bars a rich, fudgy body.
Walnuts
Add crunch and a toasty, nutty flavour against the soft batter.

The step that matters

Baking time and texture. Baking in a slow oven for the full 45 minutes sets the structure gently without drying it out. The bars should still be slightly sticky when first baked, because they firm up as they cool and overbaking makes them dry and crumbly.

Swap the walnut

How well each one fits the dish's main ingredients (butter, sugar, egg, flour, chocolate, meat):

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

Fit is the average pairing score against butter, sugar, egg, flour, chocolate, meat. 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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