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Dessert

Opera Cream Cakes

A sweet cake made from sugar, cream, and walnuts, baked in muffin tins and dipped in chocolate.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Sugar and cream are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 43,450 recipes. Both carry 2,3-butanedione, which smells butter, sweet. The science ↓

Opera Cream Cakes

Ingredients

Directions

Prepare

  1. Dust the muffin tins lightly with brown sugar.

  2. In a saucepan, combine 6 lbs of sugar, 1 teaspoon of cream of tartar, and 1¼ quarts of cream.

  3. Cook the mixture until it reaches 240°F (115°C).

  4. Pour the mixture onto a damp slab.

  5. Let the mixture cool.

Make the centers

  1. Sprinkle 1 lb of ground English walnuts on top.

  2. Cream the mixture immediately.

  3. Let the mixture set for one hour.

  4. Knead the mixture until smooth.

  5. Fill each muffin tin evenly with the mixture.

  6. Let the mixture set for another hour.

  7. Turn out the cakes.

Finish and serve

  1. Dip the cakes in melted bitter sweet chocolate.

  2. Arrange the cakes nicely.

  3. Cut a few open to show the center.

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 + creamtop 9% of all pairs
    Smell alikemoderate
    Cooked together43,450 recipes

    Shared aroma: 2,3-butanedione (butter, sweet).

  2. Walnut + chocolatetop 10% of all pairs
    Smell alikemoderate
    Cooked together1,548 recipes

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

  3. Cream + chocolatetop 11% of all pairs
    Smell alikemoderate
    Cooked together5,466 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

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

    Shared aroma: guaiacol (smoky, sweet).

  5. Cream + walnuttop 21% of all pairs
    Smell alikelow
    Cooked together1,982 recipes

    Shared aroma: octanal (fat, soap).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Sugar
Forms the sweet, fine-grained crystal structure of the fondant-like centers as it recrystallizes.
Cream of tartar
Acidifies the syrup, helping prevent large sugar crystals so the centers stay smooth.
Cream
Adds fat and moisture, giving the centers a soft, creamy texture.
Ground english walnuts
Add flavor, texture and body to the creamed mixture.

The step that matters

Cook to 240°F (115°C). Cooking the syrup to the correct concentration sets how firm the centers become after creaming. Undercooked syrup stays soft and runny, while overcooked syrup turns hard and grainy.

Swap the walnut

How well each one fits the dish's main ingredients (sugar, cream, chocolate):

  1. Almondfits better
  2. Hazelnutfits better
  3. Pistachiofits better
  4. Walnutthe original

Fit is the average pairing score against sugar, cream, chocolate. 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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