Name: Apple Island
Ingredients: 2 quarts apples; fine white sugar to taste; lemon or rose flavoring; 12 egg whites; boiled custard or imperial cream (for serving)

Why it works: Sugar and cream are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 43,450 recipes. Both carry 2,3-butanedione, which smells butter, sweet. The science ↓

Apple Island

Ingredients

Directions

Prepare the apples

Stew the apples with minimal water until soft.
Strain the stewed apples through a sieve.
Sweeten the strained apples with fine white sugar and add lemon or rose flavoring.

Finish and serve

Beat the egg whites to a hard froth and gently stir into the apple mixture just before serving.
Serve in a glass dish with boiled custard or imperial cream.

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.

Sugar + creamtop 9% of all pairs

Smell alikemoderate

Cooked together43,450 recipes

Shared aroma: 2,3-butanedione (butter, sweet).
Apple + lemontop 14% of all pairs

Smell alikemoderate

Cooked together7,551 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Apple + sugartop 18% of all pairs

Smell alikelow

Cooked together16,478 recipes

Shared aroma: beta-damascenone (apple, rose).
Sugar + lemontop 18% of all pairs

Smell alikelow

Cooked together53,532 recipes

Shared aroma: 2-nonenal (fatty, green).
Lemon + eggtop 19% of all pairs

Smell alikelow

Cooked together44,316 recipes

Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

Apple and sugar barely smell alike, yet cooks put them together in 16,478 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

Apples: Cook down into a soft, smooth purée that forms the base of the dessert.
Egg whites: Whipped to a froth, they lighten the apple purée with airy volume and a fluffy texture.
Fine white sugar: Sweetens the apple purée and balances its natural tartness.

The step that matters

Beating the egg whites to a hard froth. Egg whites hold air only when beaten to the right stiffness and folded in gently. Overbeaten whites turn grainy and deflate, while stirring too hard against the purée knocks out the air that gives the dessert its lightness.