Name: Grapefruit Cup
Ingredients: 1 grapefruit for every 4 or 5 servings; 1 teaspoon red currants; powdered sugar, to taste; 1 teaspoon kirsch (optional); 1 teaspoon curaçao (optional); 1 tablespoon orange, grapefruit, lemon, or pineapple sherbet per glass

Why it works: Grapefruit and orange match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 233 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓

Grapefruit Cup

Ingredients

1 grapefruit for every 4 or 5 servings
1 teaspoon red currants
powdered sugar, to taste
1 teaspoon kirsch (optional)
1 teaspoon curaçao (optional)
1 tablespoon orange, grapefruit, lemon, or pineapple sherbet per glass

Directions

Prepare

Cut the grapefruit in half crosswise and remove the pulp in neat pieces.
Cut the pieces in half and reserve all the juice.

Assemble and serve

Place 1 teaspoon of red currants in each glass.
Add the grapefruit pieces and juice on top, then sprinkle lightly with powdered sugar.
If desired, add 1 teaspoon each of kirsch and curaçao to each glass.
Let stand in a cool place until ready to serve.
Finish each glass with 1 tablespoon of sherbet.

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.

Grapefruit + orangetop 1% of all pairs

Smell alikestrong

Cooked together233 recipes

Shared aroma: 3-hexenal (apple, fruity).
Red currant + orangetop 7% of all pairs

Smell alikemoderate

Cooked together124 recipes

Shared aroma: alpha-pinene (pine, turpentine).
Sugar + orangetop 20% of all pairs

Smell alikelow

Cooked together19,212 recipes

Shared aroma: beta-damascenone (apple, rose).
Grapefruit + red curranttop 23% of all pairs

Smell alikemoderate

Cooked together2 recipes

Shared aroma: alpha-pinene (pine, turpentine).
Red currant + sugartop 26% of all pairs

Smell alikelow

Cooked together1,156 recipes

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

Sugar and orange 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

Grapefruit: Provides the main fruit flesh and its juice, giving the cup its tart, fresh flavour.
Powdered sugar: Sweetens the grapefruit juice and pieces, balancing their natural tartness.
Sherbet: Adds a cold, sweet, fruity topping that softens the grapefruit's acidity.