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Dessert

Rock Biscuits

A small almond and candied orange peel biscuit made with egg whites and sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Almond and orange are a kitchen classic. They rank in the top 6% of all ingredient pairs, and cooks put them together in 3,125 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓

Rock Biscuits

Ingredients

Directions

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

Prepare

  1. Preheat the oven to 350°F (175°C).

  2. In a bowl, whisk the egg whites until just broken.

Mix and shape

  1. Add the sliced almonds, chopped candied orange peel, and sifted sugar; mix well.

  2. Add enough almonds to make the mixture hold together.

  3. Spoon the mixture onto wafer paper on baking sheets, forming mounds the size of large walnuts.

Bake

  1. Bake until light brown.

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. Almond + orangetop 6% of all pairs
    Smell alikemoderate
    Cooked together3,125 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  2. Almond + sugartop 18% of all pairs
    Smell alikemoderate
    Cooked together15,679 recipes

    Shared aroma: 1-penten-3-one (fish, pungent).

  3. Orange + sugartop 20% of all pairs
    Smell alikelow
    Cooked together19,212 recipes

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

  4. Egg + sugartop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

    Shared aroma: 2-nonenal (fatty, green).

  5. Egg + almondtop 25% of all pairs
    Smell alikemoderate
    Cooked together12,645 recipes

    Shared aroma: 2,4-decadienal (seaweed).

Orange and sugar barely smell alike, yet cooks put them together in 19,212 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

Egg whites
Whisked to foam, they give the biscuits lift and bind the mixture together.
Sweet almonds
Add body and a nutty texture that helps the mounds hold their shape.
Candied orange peel
Adds sweetness and a bright citrus aroma throughout the biscuit.
Lump sugar
Sweetens the mixture and promotes browning in the oven.

The step that matters

Adding the almonds to firm the mixture. Egg whites and sugar make a loose, wet mixture. Too little almond leaves it spreading, while the right amount gives enough structure to hold the mounds. Add them gradually and check the texture before spooning.

Swap the orange

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

  1. Vanillafits better
  2. Raisinfits better
  3. Figfits better
  4. Orangethe original

Fit is the average pairing score against egg, almond, sugar. 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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