Why it works: Cheese and milk are a kitchen classic. They rank in the top 10% of all ingredient pairs, and cooks put them together in 4,426 recipes. Both carry delta-dodecalactone, which smells sweet, creamy. The science ↓
Welsh Rarebit
Ingredients
Directions
The book says “a hot oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Preheat the oven to 400°F (200°C).
Make the custard
Melt the grated cheese in the oven.
In a bowl, beat together the egg and sweet milk.
Add pepper and coarse sea salt to taste.
Mix until the mixture resembles custard.
Bake
Pour the mixture into a baking dish and bake until brown.
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.
-
Cheese + milktop 10% of all pairsSmell alikemoderateCooked together4,426 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
-
Cheese + peppertop 18% of all pairsSmell alikemoderateCooked together7,861 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Egg + milktop 18% of all pairsSmell alikemoderateCooked together88,785 recipes
Shared aroma: 2-nonenal (fatty, green).
-
Milk + peppertop 22% of all pairsSmell alikemoderateCooked together26,984 recipes
Shared aroma: ethyl 2-methylbutyrate (fruity, apple).
-
Cheese + eggtop 28% of all pairsSmell alikemoderateCooked together6,253 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
- Cheese
- Melts into the sauce and provides the rich flavor and body of the rarebit.
- Egg
- Thickens the mixture as it heats, giving it a custard-like texture.
- Sweet milk
- Loosens the mixture and adds moisture so it can blend smoothly with the cheese and egg.
The step that matters
Mix until the mixture resembles custard. The egg proteins set as the mixture warms, so it needs to be combined well and thickened to a custard-like consistency. Undercooked or unevenly mixed egg leaves a thin, lumpy topping, while overheating can make it curdle.
“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.
More welsh rarebit recipes
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.
Macaroni and Cheese102 recipes
Cheese Making50 recipes
Cheese Fritters34 recipes
Cheese Omelette31 recipes