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Baked Onions

Baked onions are onions boiled, seasoned, and baked until tender and browned.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 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 hot oven

Ingredients

Directions

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

Prepare

  1. Wash the onions but do not peel them.

  2. Boil the onions in salted water for 30 minutes.

  3. Carefully lift the onions out with a slotted spoon and place them closely together in a baking pan.

Bake and serve

  1. Sprinkle the onions with salt and pepper, and place ½ tablespoon of butter on each onion.

  2. Bake the onions in a hot oven at 400°F (200°C) for 30 minutes until tender and browned.

  3. Serve hot.

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

    Shared aroma: decanal (soap, orange peel).

  3. Pepper + buttertop 21% of all pairs
    Smell alikemoderate
    Cooked together85,593 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

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, and their skins help hold the shape.
Butter
Adds fat that carries flavor and helps the onion surfaces brown.

The step that matters

Boiling the onions in salted water. Boiling for the full 30 minutes softens the onions before baking. If they are undercooked, they may stay firm in the oven, and the browning will not make up for it.

Swap the onion

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

  1. Capsicumfits better
  2. Potatofits better
  3. Carrotfits about as well
  4. Onionthe original

Fit is the average pairing score against pepper, butter. 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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