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British Irish

Welsh Rarebit

A classic Welsh rarebit with a savoury cheddar and mustard sauce grilled over crisp toast.

Published and reviewed by Kitchgrow on 1 September 2026Updated

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Welsh Rarebit

22 mintotal

Prep 10 min · Cook 12 min

Serves
2
Difficulty
Easy
Spice
Mild
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Ingredients

Quantities are for 2 servings.

You'll need: Stovetop, Oven.

No inactive time; the cheese sauce stiffens as it cools, so spread it while it is still soft enough to spread and grill it straight away.

Method

  1. Toast the bread until firm and lightly golden so it can hold the cheese sauce.

  2. Melt the measured butter in a small pan, stir in the flour, and cook briefly until it smells lightly nutty.

  3. Whisk in the warm milk gradually until the sauce is smooth and thick.

  4. Lower the heat and stir in the cheddar until melted into a glossy sauce.

  5. Mix in the mustard, Worcestershire sauce, and pepper, then remove from the heat.

  6. Spread the cheese mixture over the toast and grill or bake at high heat until bubbling and spotted golden.

  7. Finish with the measured paprika and serve while the sauce is hot and soft.

How to tell it's done

The rarebit should be bubbling, glossy, and lightly browned on top, with crisp toast underneath.

Getting it right

Tip

Keep the cheese sauce thick enough to spread; if it is too loose, it will run off the toast under the grill.

What to serve it with

Serve as a hot snack with tomato salad, pickles, or soup.

Common mistakes

The sauce splits into oil and stringy cheese.
Melt the cheddar over low heat and take the pan off as soon as it is smooth. Cheese held over a live flame separates, and the flour-and-milk base exists precisely to hold it together — it cannot do that if the sauce boils.
The toast goes soggy.
Toast it properly firm first, and grill the rarebit hot and fast. A pale slice under a thick cheese sauce collapses; it should be dry enough to stand up to it.

Substitutions

  • Use Brown Bread instead of White Bread for a nuttier version; gluten remains.
  • Use Milk and Cheddar Cheese as listed for the classic texture; dairy-free versions change the dish identity.
  • If avoiding fish, use a vegetarian Worcestershire-style sauce only after checking the label; the flavour will differ.
  • Dijon Mustard can be replaced with a small amount of mustard paste, but heat and sharpness may vary.

Storing and reheating

Eat it hot from the grill. The cheese mixture keeps three days in the fridge and firms up to a spreadable paste, which many cooks prefer — spread it cold on toast and grill. Do not freeze.