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Baked Onions

A dish of onions baked with butter, stock, and browned flour, 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 being salted and boiling, until tender.

  2. Drain the onions well, pressing each one gently in a coarse cloth to remove excess water.

  3. Place the dry onions side by side in a baking pan.

Bake and serve

  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 hot in a deep dish.

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

  5. Pour the thickened gravy over the onions and return to the oven for 2 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.
Browned flour
Thickens the pan gravy so it coats the onions.
Butter
Adds richness and helps the onions brown in the oven.
Stock
Provides liquid that forms the gravy in the pan.

The step that matters

Drain and dry the onions well. Excess water left on the onions dilutes the gravy and stops them browning in the oven. Pressing them gently in a cloth removes this water so the surfaces can brown.

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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