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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 1 hour, changing the water twice.

  3. Drain the onions carefully and place them closely together in a baking pan.

Bake and serve

  1. Sprinkle salt and pepper on each onion and add 1 teaspoon of butter on top.

  2. Bake 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
Cooking softens them and baking browns their surfaces, giving a tender, sweet result.
Butter
Adds fat that carries flavour and helps the onion surfaces brown during baking.

The step that matters

Boil the onions in salted water for 1 hour, changing the water twice. Long boiling softens the dense layers so they become tender before baking. Changing the water removes harsh sulfur compounds that cause bitterness and strong odour, leaving a milder onion.

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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