Name: Isinglass Water
Ingredients: ¼ ounce isinglass; 1 cup milk; ½ cup sugar; 2 tablespoons orange juice

Why it works: Milk and orange are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 4,696 recipes. Both carry 1-octen-3-one, which smells mushroom, metallic. The science ↓

Isinglass Water

Ingredients

¼ ounce isinglass
1 cup milk
½ cup sugar
2 tablespoons orange juice

Directions

Dissolve the isinglass in a little milk.
Boil the mixture with 1 cup of milk until it reduces to ½ cup.
Season with sugar and orange juice.

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.

Milk + orangetop 15% of all pairs

Smell alikemoderate

Cooked together4,696 recipes

Shared aroma: 1-octen-3-one (mushroom, metallic).
Milk + sugartop 18% of all pairs

Smell alikelow

Cooked together77,875 recipes

Shared aroma: 2-nonenal (fatty, green).
Sugar + orangetop 20% of all pairs

Smell alikelow

Cooked together19,212 recipes

Shared aroma: beta-damascenone (apple, rose).

Milk and sugar barely smell alike, yet cooks put them together in 77,875 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

Isinglass: Gelatin-like protein that sets the liquid into a light, wobbly gel as it cools.
Milk: Provides the liquid base and creamy body that the isinglass is dissolved and reduced in.
Sugar: Adds sweetness to balance the tartness of the orange juice.
Orange juice: Adds bright acidity and citrus aroma to the finished liquid.

The step that matters

Boil the mixture until it reduces to ½ cup. Isinglass must be fully dissolved before the liquid is reduced, and boiling concentrates the protein so the mixture will set. Reducing too little leaves it too thin to gel; reducing too far makes it stiff.