Name: String-beans
Ingredients: string beans; ½ teaspoon coarse sea salt; ¼ teaspoon black pepper; 1 tablespoon butter; 1 teaspoon vinegar

Why it works: Beans and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 4,733 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

String-beans

Ingredients

Directions

Prepare

Trim the ends of the string beans and pare both sides with a sharp knife.
Cut the beans into short pieces.

Cook and finish

Cook the beans in boiling salted water for 40 minutes.
Drain the beans, then season with salt and pepper.
Stir in melted butter and vinegar.

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.

Beans + peppertop 11% of all pairs

Smell alikemoderate

Cooked together4,733 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Pepper + vinegartop 14% of all pairs

Smell alikemoderate

Cooked together27,814 recipes

Shared aroma: 4'-methylacetophenone (bitter almond).
Beans + buttertop 19% of all pairs

Smell alikemoderate

Cooked together2,799 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Beans + vinegartop 19% of all pairs

Smell alikemoderate

Cooked together1,347 recipes

Shared aroma: isoamyl acetate (banana, pear).
Pepper + buttertop 21% of all pairs

Smell alikemoderate

Cooked together85,593 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).

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

What each ingredient does

String beans: Main vegetable; cooking softens their fibers into a tender texture.
Butter: Adds fat, richness and a smooth coating to the beans.
Vinegar: Adds acidity that brightens the flavor and balances the butter.