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Principles Gravy

A simple gravy made with butter, flour, and onion.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 ingredients
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Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Principles Gravy

Ingredients

Directions

  1. Melt the butter in an enamelled stewpan over a brisk fire until it runs like oil.

  2. Add the flour to the melted butter and stir continuously until it turns a rich brown color.

  3. Finely chop the onion and add it to the mixture, cooking until the onion is soft and translucent.

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.

  1. Flour + buttertop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Butter + oniontop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  3. Flour + oniontop 17% of all pairs
    Smell alikemoderate
    Cooked together32,460 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Flour and butter barely smell alike, yet cooks put them together in 124,287 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

Butter
Melts to form the fat base that carries flavor and gives the gravy richness.
Flour
Thickens the fat into a roux, and browning it adds a nutty depth to the gravy.
Onion
Softens and sweetens as it cooks, adding savoury flavor to the gravy.

The step that matters

Browning the flour in the butter. Flour cooks slowly in fat, and stirring constantly prevents scorching at the bottom of the pan. Stopping at the right rich brown color gives flavor without bitterness.

Swap the onion

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

  1. Shallotfits better
  2. Leekfits better
  3. Arrowrootfits better
  4. Onionthe original

Fit is the average pairing score against flour, butter. 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.

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