Welsh Rarebit on Sourdough

More than simple cheese on toast, Welsh rarebit is a classic savoury dish where a seasoned cheese sauce is spread over toast and grilled until molten, blistered and golden. Here, thick-cut sourdough gives the topping a sturdy, tangy base, while mature cheddar, ale, Dijon and English mustard create a sharp, deeply savoury sauce with gentle heat from cayenne. Worcestershire sauce brings the familiar umami edge that makes rarebit so distinctive. Best served straight from the grill, it works well as a quick lunch, late supper or satisfying vegetarian snack.
Recipe by JustRecipes Editorial Team
Content validated: August 2026 How we create recipes
Made this recipe? Rate it
Cuisine style British savoury toast
Flavor profile Cheesy • Tangy • Savoury
Spice level Mild
Techniques Toasting • Grilling • Whisking
Key equipment Saucepan • Whisk • Grill
Time commitment Under 30 minutes

Why this recipe works

  • Crisp and molten: Toasting the sourdough before adding the sauce helps it hold its shape under the rich cheese topping.
  • Deep savoury flavour: Ale, two mustards, Worcestershire sauce and mature Cheddar build a sharp, malty and umami-rich sauce.
  • Fast to make: The sauce comes together quickly on the hob, then finishes under the grill in just a few minutes.
  • Glossy sauce: Whisking in the cheese gradually over low heat, then adding egg yolk off the heat, gives the topping a smooth, thick finish.

Get the most out of this recipe

Authenticity notes

  • Not just cheese on toast: Classic rarebit is defined by a seasoned cheese sauce rather than plain melted cheese, usually sharpened with mustard and Worcestershire sauce.
  • Bread choice: Sourdough is a modern, sturdy option; any thick-cut bread that toasts well can work, provided it can support the sauce.

Ingredient notes

  • Use mature Cheddar: A mature Cheddar gives the sauce the sharpness rarebit needs and balances the richness of the butter and egg yolk.
  • Choose the ale to taste: A maltier ale gives deeper flavour, while a lighter beer keeps the sauce gentler and less robust.
  • Check the Worcestershire sauce: Some Worcestershire sauces contain anchovies, so choose a vegetarian version if that matters for your table.

Texture tips

  • Keep the heat gentle: Melt the cheese over low heat and avoid boiling the sauce, as high heat can make it grainy.
  • Let it settle briefly: A short pause before spooning helps the sauce thicken slightly so it sits neatly on the toast.
  • Toast both sides: Lightly toasting the bread on both sides creates a firmer base and helps stop the topping soaking in too quickly.

Serving ideas

  • Serve with something sharp: A crisp green salad, pickles or chutney cuts through the richness of the cheese sauce.
  • Match the ale: Serve with the same style of ale used in the sauce for a simple, coherent pairing.
  • Finish at the table: A tiny extra splash of Worcestershire sauce adds a final savoury lift just before eating.

Equipment you'll need

Baking tray Grill Saucepan Toaster Whisk
Ingredients
Instructions
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  1. Heat the grill to high. Toast the sourdough until lightly golden on both sides, then set the slices on a baking tray.
  2. Melt the butter in a saucepan over a low heat. Pour in the ale and warm it through for 1 minute, then whisk in the Dijon mustard, English mustard, cayenne pepper and Worcestershire sauce.
  3. Add the cheddar a handful at a time, whisking until melted and smooth, keeping the heat low so it does not split. Take off the heat and whisk in the egg yolk until glossy and thickened.
  4. Spoon the cheese sauce generously over the toasted sourdough, spreading it right to the edges. Grill for 2 to 4 minutes until bubbling and golden in spots, watching closely so it does not burn.
  5. Serve straight away while the topping is still molten. If you like, add a final tiny splash of Worcestershire sauce over the top at the table.

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Recipe notes

Tips

  • Keep the heat low when melting the cheddar; if it boils hard, the sauce can turn grainy.
  • For a neater finish, let the sauce cool for 1 minute before spooning it on, so it sits thickly on the toast.
  • If you are pregnant, elderly, or immunocompromised, use pasteurised egg yolk and make sure the topping is grilled until piping hot.

Substitutions

  • Replace Ale beer with lager beer for a lighter, less malty sauce.
  • Replace Cheddar cheese with gruyere cheese for a nuttier flavour and smoother melt.
  • Replace Dijon mustard with whole-grain mustard for a coarser texture.

Storage

  • Refrigerate up to 1 days
  • Rarebit is best eaten straight away. If you have leftover sauce, cool quickly, refrigerate, then reheat gently in a saucepan over a low heat until piping hot; do not boil.

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Recipe overview

  • Servings: 2 servings
  • Total time: 20min (15min active)
  • Difficulty: Easy
  • Cuisine: British
  • Allergens:
    Eggs Gluten Milk Wheat
Beginner friendly Kid friendly
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Butter

10 oz ≈ 283 g
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Cayenne pepper

1 cup ≈ 86.4 g
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Dijon mustard

1 cup ≈ 240 g
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Worcestershire sauce

1 cup ≈ 240 ml
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