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Dessert

Opera Creams

A sweet dessert made by boiling sugar, water, butter, and vinegar, then cooling, beating, and setting into squares.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Opera Creams

Why it works: Walnut and butter are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 6,832 recipes. Both carry eucalyptol, which smells eucalyptus, herbal. The science ↓

Opera Creams

Ingredients

Directions

Make the candy

  1. Boil together sugar, water, butter, and vinegar until it forms a soft ball when dropped into cold water.

  2. Pour into buttered pans and let cool for about 5 minutes.

  3. Beat the mixture with a spoon until it becomes quite white.

Set and cut

  1. Pour onto a platter and let it set until ready to 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.

Photo for illustrative purposes only · Contact us to use it

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. Walnut + buttertop 15% of all pairs
    Smell alikemoderate
    Cooked together6,832 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  2. Sugar + vinegartop 15% of all pairs
    Smell alikemoderate
    Cooked together20,806 recipes

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

  3. Sugar + buttertop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

  4. Walnut + vinegartop 22% of all pairs
    Smell alikemoderate
    Cooked together1,769 recipes

    Shared aroma: sotolon (curry, maple).

  5. Butter + vinegartop 23% of all pairs
    Smell alikemoderate
    Cooked together13,513 recipes

    Shared aroma: isoamyl acetate (banana, pear).

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

What each ingredient does

Sugar
Forms the sweet candy base that hardens as it cools.
Butter
Adds fat that softens the candy's texture and richness.
Vinegar
Acidity helps prevent sugar from crystallising into a grainy texture.

The step that matters

Beat the mixture until it becomes quite white. Beating while the sugar mixture cools encourages fine crystals to form, turning the candy opaque and creamy rather than glassy. Stopping too early or too late changes the final texture.

Swap the walnut

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

  1. Almondfits better
  2. Sesamefits better
  3. Soybeanfits about as well
  4. Walnutthe original

Fit is the average pairing score against sugar, butter, vinegar. 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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