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Baked Onions

Baked onions are cooked, seasoned, baked, and served with a thickened gravy.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 quick oven

Ingredients

Directions

The book says “a quick oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.

Prepare the onions

  1. Cook the onions in two waters, the second salted and boiling, until tender.

  2. Drain and press each onion gently in a coarse cloth to remove excess water.

  3. Place the onions side by side in a bake-pan.

Bake and make the gravy

  1. Season with salt, pepper, and butter, then add the stock.

  2. Bake in a 400°F (200°C) oven until browned.

  3. Remove the onions and keep them warm in a deep dish.

  4. Thicken the remaining gravy in the pan with browned flour.

  5. Pour the thickened gravy over the onions.

  6. Return the dish to the oven for two minutes before serving.

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. Pepper + flourtop 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

Onions
Become tender and sweet as they cook, forming the body of the dish.
Butter
Adds fat and richness, helping the onions brown and flavour the gravy.
Stock
Provides liquid for the gravy and moisture during baking.
Browned flour
Thickens the gravy so it coats the onions rather than running off.

The step that matters

Pressing the onions dry. Excess water left in the onions dilutes the gravy and stops the surfaces from browning properly, so each onion should be gently pressed before baking.

Swap the onion

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

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

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