Name: Spanish Onions
Ingredients: onions; cooked meat; 1 green pepper; salt; black pepper; butter; red chili peppers

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

Ingredients

Directions

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

Preheat the oven to 350°F (175°C).
Remove the hearts from the onions.
Chop the onions, cooked meat, green pepper, salt, and black pepper finely.
Fry the mixture until browned.
Fill the onions with the mixture and place a small piece of butter on top of each.
Bake the onions until done.
Prepare a sauce from red chili peppers and pour it over the baked onions.
Return the onions to the oven for a few 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.

Onion + peppertop 11% of all pairs

Smell alikemoderate

Cooked together68,474 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Onion + buttertop 15% of all pairs

Smell alikemoderate

Cooked together42,912 recipes

Shared aroma: decanal (soap, orange peel).
Meat + buttertop 16% of all pairs

Smell alikemoderate

Cooked together7,594 recipes

Shared aroma: guaiacol (smoky, sweet).
Onion + meattop 17% of all pairs

Smell alikelow

Cooked together6,364 recipes

Shared aroma: 2,4-decadienal (seaweed).
Meat + peppertop 19% of all pairs

Smell alikelow

Cooked together8,777 recipes

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