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Baked Onions

Baked onions simmered in stock, seasoned, baked, and topped with a browned flour 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 good oven

Ingredients

Directions

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

Prepare the onions

  1. Cook onions in two waters; the second should be salted and boiling.

  2. Drain onions when tender.

Bake

  1. Arrange onions closely together in a baking dish.

  2. Season onions with pepper, salt, and butter generously.

  3. Pour a little strained soup stock over the onions.

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

Serve

  1. Transfer onions to a deep dish.

  2. Pour over thickened gravy made with browned flour, cooked for one minute.

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
Form the bulk of the dish and become soft and sweet when cooked.
Butter
Adds fat and richness, helping the onions brown and taste rounded.
Soup stock
Adds moisture and savory flavor as the onions bake.
Browned flour
Thickens the gravy and adds a toasted, nutty flavor.

The step that matters

Bake until browned. Baking at high heat until the surface browns develops flavor through the Maillard reaction, but overbaking can dry the onions and make them bitter.

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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