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Opera Cream Bar

A sweet confection made from sugar, glucose, cream, and vanilla, cooked to a firm caramel and cut into bars.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Sugar and vanilla are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 35,032 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓

Opera Cream Bar

Ingredients

Directions

Cook the base

  1. Combine sugar, glucose, and cream in a kettle.

  2. Set the kettle on fire and mix until it reaches a steady boil.

  3. Insert a thermometer and cook until it reaches 244°F (118°C).

Shape and set

  1. Pour the mixture onto a damp slab.

  2. After five minutes, add vanilla to the mixture.

  3. When it forms a firm mass, cover with a damp cloth and let it sweat for 30 minutes.

  4. Soften the mixture with your hands and form it into caramel pans lined with wax paper.

  5. Once set, turn out and cut into bars ½ inch wide and 3½ inches long.

Coat the bars

  1. Dip the bars in sweet coating while stirring continuously during boiling.

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

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

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

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

  3. Cream + vanillatop 15% of all pairs
    Smell alikelow
    Cooked together12,301 recipes

    Shared aroma: 2-nonanone (fruity, floral).

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, when cooked to temperature, sets into a firm, chewy mass.
Glucose
Interferes with sugar crystallization, keeping the candy smooth and less grainy.
Cream
Adds fat and richness, softening the texture of the cooked mass.
Vanilla
Adds aroma to the finished bars.

The step that matters

Cooking to 244°F (118°C). The final temperature controls how much water remains and therefore how firm the set bars will be. Stopping early leaves the centre soft and sticky, while cooking too long makes it hard and brittle.

“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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