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Spanish Onions Baked

Baked onions seasoned with salt, butter, pepper, and coarse sea salt, served with optional brown sauce.

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 ↓

Spanish Onions Baked

Ingredients

Directions

The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.

  1. Boil unpeeled onions in salted boiling water for 1 hour.

  2. Dry the onions and wrap them in greased paper, twisting the ends to seal in steam.

  3. Bake the wrapped onions at 400°F (200°C) for 1 to 2 hours, longer if very large.

  4. Remove the paper, peel the onions, and serve with butter, pepper, and coarse sea salt, or with brown sauce.

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 + saucetop 15% of all pairs
    Smell alikelow
    Cooked together15,338 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

    Shared aroma: decanal (soap, orange peel).

  4. Onion + saucetop 19% of all pairs
    Smell alikelow
    Cooked together10,474 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  5. Butter + peppertop 21% of all pairs
    Smell alikemoderate
    Cooked together85,593 recipes

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

Butter and sauce barely smell alike, yet cooks put them together in 15,338 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

Large white-skinned onions
Become sweet and tender as their sugars soften during long cooking, with the steam trapped by the wrapping.

The step that matters

Wrapping the onions to trap steam. Sealing the onions tightly in greased paper keeps steam around them while they bake, so they cook through and turn soft instead of drying out at the surface.

Swap the onion

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

  1. Capsicumfits better
  2. Tomatofits about as well
  3. Mustardfits about as well
  4. Onionthe original

Fit is the average pairing score against butter, pepper, sauce. 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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