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Baked Onions

Baked onions served with a brown stock sauce.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Baked Onions

Oven, in the book's wordsA moderate oven

Ingredients

Directions

The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.

Prepare the onions

  1. Soak the onions overnight in boiling water with dissolved baking soda.

  2. An hour before serving, place the onions in a saucepan, cover with cold water, and bring to a boil.

  3. Boil the onions for 15 minutes, then drain and place in a vegetable dish.

Make the sauce

  1. Melt 2 ounces of butter and mix with flour, then gradually add the brown stock.

  2. Bring the mixture to a boil, add the cream, and cook for 2 minutes.

  3. Season the sauce with pepper and remaining salt, then pour over the onions.

Bake and serve

  1. Sprinkle the onions with the remaining butter, and bake in a 350°F (175°C) oven for 30 minutes.

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

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

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

    Shared aroma: isobutyraldehyde (malty, green).

  3. Onion + buttertop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  4. Onion + flourtop 17% of all pairs
    Smell alikemoderate
    Cooked together32,460 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Flour + peppertop 19% of all pairs
    Smell alikemoderate
    Cooked together50,459 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

Spanish onions
Main vegetable; cooking softens its texture and brings out its sweetness.
Butter
Adds fat and richness, and helps the top of the onions brown in the oven.
Flour
Thickens the sauce when cooked with the butter and liquid.
Brown stock
Forms the savory liquid base of the sauce.
Baking soda
Its alkaline soak helps soften the onions before cooking.

The step that matters

Adding the stock to the butter and flour. Adding the liquid gradually while mixing keeps the flour from clumping, so the sauce thickens smoothly once it reaches a boil.

Swap the onion

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

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

Fit is the average pairing score against butter, flour, 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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