Name: A Cheap and Good Gravy
Ingredients: 3 onions; 2 tablespoons butter; 1 large slice of bread; any bit of meat or bone (e.g., from a leg of mutton); some herbs; water (enough to cover ingredients); salt to taste; pepper to taste

Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓

A Cheap and Good Gravy

Ingredients

Directions

Prepare

Fry the onions in butter until nicely browned.
Toast the bread until hard and very brown, but not burnt.

Make the gravy

Combine the onions, bread, meat or bone, herbs, and water in a pot.
Stew until the gravy is thick and rich.
Add salt and pepper to taste, strain, and keep cool.

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.

Butter + breadtop 7% of all pairs

Smell alikemoderate

Cooked together27,232 recipes

Shared aroma: delta-decalactone (sweet, creamy).
Onion + peppertop 11% of all pairs

Smell alikemoderate

Cooked together68,474 recipes

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

Smell alikemoderate

Cooked together2,924 recipes

Shared aroma: 2,4-decadienal (seaweed).
Onion + buttertop 15% of all pairs

Smell alikemoderate

Cooked together42,912 recipes

Shared aroma: decanal (soap, orange peel).
Onion + breadtop 15% of all pairs

Smell alikemoderate

Cooked together8,676 recipes

Shared aroma: 2,4-decadienal (seaweed).

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

What each ingredient does

Onions: Browned in butter, they add deep, sweet savoury flavour to the gravy.
Butter: Fat that carries the browning and adds richness to the onions.
Bread: Toasted until dark, it adds toasty colour and a roasted, nutty flavour to the gravy.
Meat or bone: Releases gelatin and savoury flavour into the water as it stews.

The step that matters

Toast the bread until hard and very brown, but not burnt.. Bread that is too pale adds little colour or flavour, while burnt bread turns the gravy bitter. Browning relies on the Maillard reaction, which needs dry heat and careful timing.

Swap the onion

How well each one fits the dish's main ingredients (butter, bread, meat, pepper):

Capsicumfits better
Potatofits better
Tomatofits about as well
Onionthe original

Fit is the average pairing score against butter, bread, meat, pepper. Candidates are from the same food group and used in at least 100 recipes.

“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.

Brown Bread461 recipes

White Bread80 recipes

Bread Omelette60 recipes

Meat Croquettes52 recipes

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A Cheap and Good Gravy