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Baked Onions

Baked onions are slow‑cooked onions wrapped in buttered paper, then browned and served with melted butter, pepper, and salt.

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 slow oven

Ingredients

Directions

The book says “a slow oven”. The 300°F (150°C) in the steps is the modern equivalent, not the book's own figure.

Prepare the onions

  1. Wash the onions thoroughly without removing the skins.

  2. Boil the onions in salted water for 1 hour, changing the water twice with boiling‑hot water.

  3. Remove the onions and place them on a cloth to absorb moisture.

Bake and finish

  1. Wrap each onion in buttered tissue paper, twisting the top to seal it, and bake in a 300°F (150°C) oven for nearly 1 hour.

  2. Once tender, peel the onions and place them in a deep dish.

  3. Brown the onions slightly by basting with butter for about 15 minutes.

  4. Serve in a vegetable dish, pouring melted butter over them and sprinkling with pepper and salt.

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. Butter + peppertop 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
Gentle boiling and baking soften them until tender, while their sugars develop a mild, sweet flavour.
Butter
Adds richness and moisture, and helps the onions brown lightly when basted.
Coarse sea salt
Seasons the cooking water and the finished onions, bringing out their flavour.

The step that matters

Drying the onions before wrapping. Removing surface moisture on a cloth keeps the buttered tissue from turning soggy and helps the butter cling and brown rather than steam the onions.

Swap the onion

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

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

Fit is the average pairing score against butter, pepper. 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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