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To Ragoo Onions

Sautéed onions cooked in butter, flour, gravy, mustard, salt, and pepper, topped with fried bread crumbs.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Onion and mustard match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 9,259 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

To Ragoo Onions

Ingredients

Directions

Prepare

  1. Peel the small onions and the large onions, cutting the large ones very small.

Cook the onions

  1. Melt the butter in a stew-pan until it makes noise.

  2. Add the onions and fry until they begin to brown.

  3. Dredge in a little flour and shake until thick.

Finish and serve

  1. Add salt, pepper, gravy, and mustard; stir well.

  2. Pour into a dish and garnish with fried bread crumbs.

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. Onion + mustardtop 6% of all pairs
    Smell alikestrong
    Cooked together9,259 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  2. Mustard + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  4. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Flour + mustardtop 13% of all pairs
    Smell alikemoderate
    Cooked together5,066 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Butter and flour 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

Onions
Provide the main body, and browning adds sweetness and savory depth.
Butter
Adds fat and richness, and carries the flavor of the onions.
Flour
Thickens the cooking liquid so the sauce clings to the onions.
Gravy
Supplies the liquid that forms the sauce and adds savory flavor.
Mustard
Adds a sharp, pungent note that cuts through the richness of the butter.

The step that matters

Fry the onions until they begin to brown. Browning develops sweetness and savory flavor through the Maillard reaction and caramelization. Pale onions taste flat and raw, while over-dark onions turn bitter, so watch them closely.

Swap the onion

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

  1. Shallotfits better
  2. Horseradishfits better
  3. Chivefits better
  4. Onionthe original

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

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