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Stuffed Spanish Onions

A dish of onions filled with a seasoned kidney and breadcrumb mixture, baked in stock.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 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 ↓

Stuffed Spanish Onions

Oven, in the book's wordsA moderate oven

Ingredients

Directions

The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.

Prepare the onions

  1. Remove the thin outer skin and twist off the roots of the onions.

  2. Cover the onions with boiling salted water and boil gently for 15 minutes, then drain and let cool slightly.

Make the filling

  1. In a frying pan, cook the chopped kidney with butter, salt, and pepper until nicely colored.

  2. Stir in the bread crumbs and remove from heat.

  3. Cut off the tops of the onions and scoop out the centers, then chop the centers and add to the kidney mixture.

Stuff and bake

  1. Stuff the onions with the mixture, mounding it over the tops.

  2. Arrange the stuffed onions in a baking pan, placing a small piece of butter on each.

  3. Half fill the pan with stock and bake at 350°F (175°C) for 40 to 60 minutes.

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. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

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

    Shared aroma: decanal (soap, orange peel).

  4. Onion + breadtop 15% of all pairs
    Smell alikemoderate
    Cooked together8,676 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  5. Pepper + breadtop 16% of all pairs
    Smell alikemoderate
    Cooked together20,964 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 filling and softens as it bakes, becoming sweet.
Veal kidney
Provides the rich, savory meat base of the filling, browning in the pan for depth of flavor.
Bread crumbs
Absorb juices and bind the kidney mixture so the filling holds its shape.
Butter
Adds fat for richness and helps the filling and onion tops brown in the oven.

The step that matters

Cooking the kidney until nicely colored. Browning the kidney in the pan builds deep, savory flavor through the Maillard reaction. Undercooked, pale meat tastes flat and may stay grey and soft in the filling.

Swap the onion

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

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

Fit is the average pairing score against veal, butter, pepper, bread. 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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