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To Ragout Onions

A savory onion ragout made with butter, flour, gravy, mustard, and fried bread crumbs.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 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 Ragout Onions

Ingredients

Directions

Prepare

  1. Peel the young onions and cut the large ones into small pieces.

  2. Melt the butter in a stewpan.

Make the ragout

  1. Add the onions and fry until they are brown.

  2. Dust the onions with flour and stir until thickened.

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

  4. 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. Butter + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

  3. Pepper + mustardtop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

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

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

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

  5. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 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 bulk of the ragout and, when fried, brown sugars that add sweetness and depth.
Butter
Fats the pan so the onions fry and brown instead of steaming, and adds richness.
Flour
Thickens the gravy and juices into a cohesive sauce that clings to the onions.
Gravy
Supplies liquid and savory flavor, forming the body of the sauce once thickened.
Mustard
Adds sharp, pungent flavor that balances the sweetness of the browned onions.

The step that matters

Frying the onions until brown. Onions must brown properly, not steam, for good flavor. Crowding the pan or adding moisture too early keeps them pale and soft. Browning is what gives the sauce its depth.

Swap the onion

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

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

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