Name: Onion Sauce
Ingredients: one-half pint of milk over to boil; a piece of butter half size of egg; four white onions until they are tender; half size of egg; salt; pepper

Why it works: Milk and butter are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Onion Sauce

Ingredients

Directions

Boil three or four white onions until they are tender, and then mince them fine ; put one-half pint of milk over to boil ; add a piece of butter half size of egg, and a little salt and pepper ; stir in the minced onion and a table- spoon of flour, which has been moistened with milk ; let it cream over boiling water.

Nutrition, whole recipe (rough)

379Calories

16 gProtein

25 gFat

24 gCarbs

What these numbers assume: 6 portions

Ingredient	Portion assumed	kcal
Milk	1 cup (244ml) whole	149
Butter	1 tbsp (14g)	102
Egg	1 large egg (50g)	78
Onion	1 medium (110g)	44
Black Pepper	1 tsp ground (2.3g)	6
Salt	1 tsp (6g)	0

One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.

By Home for the Friendless (Chicago, Ill.). 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. See the original page.

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 + buttertop 7% of all pairs

Smell alikemoderate

Cooked together81,283 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Onion + peppertop 11% of all pairs

Smell alikemoderate

Cooked together68,474 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Butter + oniontop 15% of all pairs

Smell alikemoderate

Cooked together42,912 recipes

Shared aroma: decanal (soap, orange peel).
Butter + eggtop 17% of all pairs

Smell alikemoderate

Cooked together118,967 recipes

Shared aroma: decanal (soap, orange peel).
Milk + eggtop 18% of all pairs

Smell alikemoderate

Cooked together88,785 recipes

Shared aroma: 2-nonenal (fatty, green).