Name: Onions Browned in Butter
Ingredients: 2 cups onions, sliced; ¼ teaspoon coarse sea salt; 1 cup boiling water; 1 tablespoon butter

Why it works: Onion and butter are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 42,912 recipes. Both carry decanal, which smells soap, orange peel. The science ↓

Onions Browned in Butter

Ingredients

2 cups onions, sliced
¼ teaspoon coarse sea salt
1 cup boiling water
1 tablespoon butter

Directions

Simmer the onions

Combine sliced onions, salt, and boiling water in a pot. Cover and cook until tender.
Drain the water, reserving it for soup.

Brown the onions

Add butter to the onions and stir until melted.
Fry the onions until they are a delicate brown, moving the pan to prevent burning.

Prepare

Soak onions in cold water while peeling to avoid eye irritation.

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.

Onion + buttertop 15% of all pairs

Smell alikemoderate

Cooked together42,912 recipes

Shared aroma: decanal (soap, orange peel).

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

What each ingredient does

Onions: Provide the main bulk, and their natural sugars caramelize into sweetness and color when browned.
Butter: Adds fat and rich flavor, and its milk solids help the onions brown.

The step that matters

Fry the onions until delicately brown. Onion sugars caramelize slowly over moderate heat, building sweetness and color. If the pan is too hot or left still, the sugars scorch and turn bitter, so moving the pan keeps heat even.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

Tomato Soup526 recipes

Brown Bread461 recipes

Mutton Broth292 recipes

Yorkshire Pudding264 recipes

Like knowing why a recipe works?

The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.

Prefer an account? Create a free account to save pairings and unlock the full chemistry.

Onions Browned in Butter