Name: Jelly for Orange Cake
Ingredients: 2 good oranges; 1 cup sugar; 2 tablespoons water; 1 tablespoon corn-starch; 2 egg whites; powdered sugar (for frosting)

Why it works: Orange and corn work together. They rank in the top 11% of all ingredient pairs, and cooks put them together in 586 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓

Jelly for Orange Cake

Ingredients

Directions

Prepare the oranges

Grate the rind of one orange.
Peel both oranges.
Grate the peeled oranges.
Remove the seeds.

Make the jelly

Add sugar and water.
Scald in a tin pail set in a kettle of hot water.
Mix corn‑starch with a few spoons of cold water until smooth.
Stir the mixture into the orange mixture.
Cook just enough to cook the corn‑starch.

Frost and finish

When nearly cold, beat the egg whites.
Add powdered sugar for frosting.
Reserve some frosting for the top of the cake.
Stir the remaining frosting into the orange mixture.
Create a jelly that will not run off or soak into the cake.

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.

Orange + corntop 11% of all pairs

Smell alikemoderate

Cooked together586 recipes

Shared aroma: 2,4-decadienal (seaweed).
Orange + sugartop 20% of all pairs

Smell alikelow

Cooked together19,212 recipes

Shared aroma: beta-damascenone (apple, rose).
Sugar + eggtop 21% of all pairs

Smell alikemoderate

Cooked together122,807 recipes

Shared aroma: 2-nonenal (fatty, green).
Sugar + corntop 21% of all pairs

Smell alikelow

Cooked together7,168 recipes

Shared aroma: 2-nonenal (fatty, green).
Corn + eggtop 26% of all pairs

Smell alikemoderate

Cooked together7,484 recipes

Shared aroma: (e)-2-octenal (fatty, green).

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

Oranges: Provide the juice, pulp and rind that give the jelly its flavour and aroma.
Sugar: Adds sweetness and body to the jelly.
Corn-starch: Thickens the orange mixture so the jelly sets firm rather than running off.
Egg whites: Whipped into the frosting, they add lightness and a stable, airy texture.

The step that matters

Cook just enough to cook the corn‑starch. Cornstarch thickens when heated and its granules must swell fully to set the jelly. Undercooking leaves a raw starchy taste and weak set, while overcooking can break down the thickening power and make the jelly thin.