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Dessert

Onyx Caramels

Onyx Caramels are a candy made from sugar, glucose, grease, cream, condensed milk, and marshmallows, flavored with vanilla.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 ↓

Onyx Caramels

Ingredients

Directions

Make the caramel

  1. In a large pot, combine sugar, glucose, and grease. Set on fire and stir until it reaches a soft ball stage.

  2. Add 1 quart of cream and cook again to soft ball stage.

  3. Stir in 1 quart of condensed milk and cook to medium ball stage.

  4. Add another quart of condensed milk and cook until it reaches a stiff ball stage.

Finish and set

  1. Remove from heat, flavor with vanilla, and gently fold in the dry marshmallows.

  2. Pour the mixture onto a greased slab and spread it smoothly; the surface should resemble onyx.

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 the sweet base and, as it cooks, sets the firmness of the candy.
Glucose
Interferes with sugar crystals, keeping the caramel smooth rather than grainy.
Cream
Adds fat and milk solids, giving a softer, richer texture.
Dry marshmallows
Melt into the hot mixture, adding body and a chewy, airy softness.

The step that matters

Cook each stage to the right ball stage. As water evaporates, the sugar concentration rises, so the firmness of the cooled candy depends on stopping at the correct stage. Overcooking makes it hard and brittle; undercooking leaves it sticky.

“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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