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Spanish Onions Stuffed

Spanish onions are hollowed, filled with a mushroom and breadcrumb mixture, baked, and served with a butter‑flour‑milk sauce.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 12 ingredients
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Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓

Spanish Onions Stuffed

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.

Prepare the onions

  1. Wash and peel the onions, then tie them to prevent breaking.

  2. Place the onions in a saucepan, cover with boiling water, and cook for 2 to 3 hours until tender.

  3. Drain the onions and carefully remove the centers, leaving about ¼ inch for the shell.

Make the stuffing

  1. Chop the onion centers and mushrooms very finely and cook them together until the moisture evaporates.

  2. Add butter, cream, bread crumbs, salt, and pepper to the mixture and stir well.

  3. Fill the onion shells with the stuffing, smooth the tops, sprinkle with bread crumbs, and brush with beaten egg and butter.

  4. Bake in a preheated oven at 400°F (200°C) for about 10 minutes until browned.

Make the sauce and serve

  1. For the sauce, rub together butter and flour, then heat milk in a saucepan.

  2. Stir in the butter and flour mixture and add chopped mushrooms, seasoning with salt and pepper.

  3. Serve the stuffed onions on a platter with the sauce poured around them, garnished with parsley.

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. Butter + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

  2. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  3. Mushroom + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together12,525 recipes

    Shared aroma: trans-2-decenal (waxy, orange).

  4. Butter + creamtop 8% of all pairs
    Smell alikemoderate
    Cooked together41,516 recipes

    Shared aroma: delta-dodecalactone (sweet, creamy).

  5. Mushroom + breadtop 10% of all pairs
    Smell alikemoderate
    Cooked together2,536 recipes

    Shared aroma: 2-nonenal (fatty, green).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Spanish onions
Form the edible shell that holds the stuffing and softens into a sweet, tender base.
Mushrooms
Add savory, earthy flavor and moisture to the stuffing and sauce.
Bread crumbs
Absorb moisture from the stuffing and form a browned crust on top.
Egg
Binds the crust and helps it brown when brushed on top.
Butter
Adds richness and helps the crust brown and the sauce thicken.
Flour
Thickens the milk into a smooth sauce when cooked with butter.

The step that matters

Evaporating the moisture from the onion and mushroom mixture. If the chopped onion and mushrooms still hold water, the stuffing turns soggy and dilutes the bread crumbs. Cooking them until the liquid evaporates concentrates flavor and gives a firm filling that holds its shape.

Swap the onion

How well each one fits the dish's main ingredients (mushroom, butter, cream, bread, pepper, egg, milk):

  1. Potatofits better
  2. Asparagusfits better
  3. Capsicumfits better
  4. Onionthe original

Fit is the average pairing score against mushroom, butter, cream, bread, pepper, egg, milk. 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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