Name: Knickerbocker Cake Filling
Ingredients: 3 egg whites; 1 pound powdered sugar; ¼ pound seeded raisins, chopped; ¼ pound citron, finely chopped; ½ pound almonds, finely chopped; ¼ pound figs, finely chopped; ¼ pound French candies, mashed; 1 cup grated coconut (optional)

Why it works: Raisin and almond are a kitchen classic. They rank in the top 2% of all ingredient pairs, and cooks put them together in 1,781 recipes. Both carry 2-nonanone, which smells fruity, floral. The science ↓

Knickerbocker Cake Filling

Ingredients

3 egg whites
1 pound powdered sugar
¼ pound seeded raisins, chopped
¼ pound citron, finely chopped
½ pound almonds, finely chopped
¼ pound figs, finely chopped
¼ pound French candies, mashed
1 cup grated coconut (optional)

Directions

In a large bowl, beat the egg whites until stiff peaks form.
Gradually add the powdered sugar, mixing until well combined.
Fold in the chopped raisins, citron, almonds, figs, and mashed French candies.
If desired, add the grated coconut and mix gently.

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.

Raisin + almondtop 2% of all pairs

Smell alikemoderate

Cooked together1,781 recipes

Shared aroma: 2-nonanone (fruity, floral).
Almond + figtop 3% of all pairs

Smell alikestrong

Cooked together519 recipes

Shared aroma: alpha-pinene (pine, turpentine).
Almond + coconuttop 3% of all pairs

Smell alikestrong

Cooked together1,093 recipes

Shared aroma: 2,3,5-trimethylpyrazine (cocoa, roasted).
Raisin + figtop 7% of all pairs

Smell alikemoderate

Cooked together737 recipes

Shared aroma: beta-damascenone (apple, rose).
Fig + coconuttop 7% of all pairs

Smell alikestrong

Cooked together88 recipes

Shared aroma: ethyl caproate (fruity, apple peel).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Egg whites: Whipped into stiff peaks, they create an airy, light structure for the filling.
Powdered sugar: Dissolves into the whipped whites, adding sweetness and body to the filling.
Almonds: Add richness and a firm, chopped texture that gives the filling bite.
Raisins: Add concentrated sweetness and chewy texture throughout the filling.

The step that matters

Adding the powdered sugar. Adding sugar gradually to beaten egg whites helps keep the foam stable. Adding it all at once can deflate the foam and leave the filling loose.

Swap the coconut

The recipe marks coconut as optional. How well each one fits the dish's main ingredients (egg, sugar, raisin, almond, fig):

Vanillafits better
Datesfits better
Apricotfits about as well
Coconutthe original

Fit is the average pairing score against egg, sugar, raisin, almond, fig. 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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Knickerbocker Cake Filling