Name: Welsh Rarebit
Ingredients: Bread; Butter; Cheese; Made mustard; Eggs; Butter (for second recipe); Cheese (for second recipe); Salt; Pepper

Why it works: Bread and butter 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 ↓

Welsh Rarebit

Oven, in the book's wordsA hot oven

Ingredients

Directions

The book says “a hot oven”. The 400°F in the steps is the modern equivalent, not the book's own figure.

Toast the bread quickly without drying it out.
Cut off the crust evenly with a sharp knife.
Butter the bread and cover it with thin slices of cheese, lightly spread with made mustard.
Place the bread on a pie plate and bake in a hot oven (400°F / 200°C) until the cheese melts.
Cut into halves or thirds and serve immediately.

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.

Bread + buttertop 7% of all pairs

Smell alikemoderate

Cooked together27,232 recipes

Shared aroma: delta-decalactone (sweet, creamy).
Bread + cheesetop 7% of all pairs

Smell alikemoderate

Cooked together2,130 recipes

Shared aroma: delta-decalactone (sweet, creamy).
Butter + cheesetop 8% of all pairs

Smell alikemoderate

Cooked together7,962 recipes

Shared aroma: delta-dodecalactone (sweet, creamy).
Mustard + peppertop 9% of all pairs

Smell alikemoderate

Cooked together15,430 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Cheese + mustardtop 11% of all pairs

Smell alikemoderate

Cooked together1,805 recipes

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

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

Swap the mustard

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

Capsicumfits better
Asparagusfits about as well
Potatofits about as well
Mustardthe original

Fit is the average pairing score against bread, butter, cheese, egg, pepper. Candidates are from the same food group and used in at least 100 recipes.