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Onyx Caramels

A chewy caramel candy made with sugar, glucose, grease, cream, condensed milk, marshmallows, and vanilla.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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 base

  1. In a large pot, combine sugar, glucose, and grease. Heat and stir until it reaches the soft ball stage.

  2. Add 1 quart of cream and continue cooking until it reaches the soft ball stage again.

  3. Stir in 1 quart of condensed milk and cook until it reaches the medium ball stage.

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

Finish and set

  1. Remove from heat, add vanilla extract, and gently fold in the dry marshmallows without fully mixing.

  2. Pour the mixture onto a greased slab and spread it out 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. Sugar + condensed milktop 11% of all pairs
    Smell alikemoderate
    Cooked together804 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  4. Cream + condensed milktop 14% of all pairs
    Smell alikemoderate
    Cooked together416 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  5. 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
Forms the bulk of the caramel and provides sweetness and structure as it cooks.
Glucose
Inhibits crystallization, keeping the caramel smooth and pliable rather than grainy.
Cream
Adds fat and moisture, giving the caramel a softer, richer texture.
Condensed milk
Contributes milk solids and sweetness, adding body and a deeper caramel flavor.
Dry marshmallows
Folded in without full mixing, they add airy pockets and a marbled, softer texture.

The step that matters

Stop at the stiff ball stage. Sugar syrup temperature rises quickly near the end of cooking. Going past the target stage makes the caramel harden when cool, while stopping early leaves it soft and 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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