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Baked Onions

Baked onions are onions boiled, wrapped in buttered paper, baked, browned, and finished with melted butter, pepper, and coarse sea salt.

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 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.

  2. Place the onions in a saucepan with slightly salted water and boil for 1 hour, adding more boiling water as needed.

  3. Remove the onions and let them dry on a cloth.

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 or until tender.

  2. Peel the onions and place them in a deep dish.

  3. Brown the onions slightly by basting them freely with butter for an additional 15 minutes.

  4. Season with pepper and coarse sea salt, then pour melted butter over the top.

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

Large spanish or bermuda onions
Provide the sweet, tender flesh that becomes soft and mild during long cooking.
Butter
Adds richness and moisture, and helps the onions brown when basted.

The step that matters

Brown the onions slightly by basting them freely with butter. Butter carries heat to the onion surface and promotes browning, so basting keeps the exterior golden without drying it out. Too little basting leaves the surface pale.

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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