Why it works: Cheese and mustard are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 1,805 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Welsh Rarebit
Ingredients
Directions
The book says “the 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).
In a bowl, mix the grated cheese with mustard, salt, and cayenne.
Heap the cheese mixture on the buttered toast.
Bake and serve
Place the toast in the hot oven for a few moments until the cheese begins to melt.
Serve immediately.
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 + mustardtop 11% of all pairsSmell alikemoderateCooked 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
What each ingredient does
- Grated cheese
- Melts into a rich, spreadable topping that becomes creamy and savoury when heated.
- Mustard
- Adds a sharp, tangy note that balances the richness of the cheese.
- Buttered toast
- Provides a crisp, absorbent base that holds the melted cheese topping.
The step that matters
Baking the toast. Heat should be brief and hot so the cheese melts and softens without becoming oily or stringy. Overheating causes the fats and proteins in cheese to separate, leaving a greasy, grainy texture.
“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
Macaroni and Cheese102 recipes
Cheese Making50 recipes
Cheese Fritters34 recipes
Cheese Omelette31 recipesThe 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.