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Dessert

Swiss Rusk

A sweet, almond-flavored rusk baked from butter, sugar, flour, almonds, eggs, and lemon zest.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Flour and almond are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 8,673 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Swiss Rusk

Oven, in the book's wordsA moderate oven

Ingredients

Directions

The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.

Prepare

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

Make the batter

  1. In a bowl, cream the butter and sugar together until light and fluffy.

  2. Add the eggs one at a time, mixing well after each addition.

  3. Stir in the ground almonds, flour, and lemon zest until combined.

Bake and finish

  1. Spread the mixture about 1 inch thick in a buttered and sugared square tin.

  2. Bake in the preheated oven until golden brown.

  3. Turn out onto a sheet of paper to cool.

  4. Once cool, cut into shapes as desired.

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. Flour + almondtop 5% of all pairs
    Smell alikemoderate
    Cooked together8,673 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Almond + lemontop 10% of all pairs
    Smell alikestrong
    Cooked together5,655 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  3. Butter + almondtop 11% of all pairs
    Smell alikemoderate
    Cooked together9,245 recipes

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

  4. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Flour + sugartop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

Butter and flour barely smell alike, yet cooks put them together in 124,287 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

Butter
Creamed with sugar to trap air and give a tender, rich crumb.
Eggs
Bind the mixture and add structure and richness as they set in the oven.
Ground almonds
Add moisture, flavour and a tender texture, and help the rusk stay crumbly.
Flour
Provides the structure that holds the rusk together as it bakes.
Sugar
Sweetens the rusk and helps it brown as it bakes.

The step that matters

Creaming the butter and sugar. Beating until light and fluffy incorporates air that helps lift the batter. Adding eggs slowly keeps the emulsion stable so the batter does not curdle.

Swap the lemon

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

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

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