Ingredients
Method
- Heat the grill to medium-high. Toast the bread on one side.
- Melt the butter in a small pan, stir in the flour and cook for 1 minute.
- Add the ale gradually, whisking until smooth and thick, then take off the heat.
- Stir in the cheese, mustard, Worcestershire sauce, cayenne and egg yolk, if using. Season with black pepper and leave to cool slightly.
- Spread the sauce over the untoasted side of the bread, right to the edges.
- Grill for 3 to 4 minutes until bubbling and golden. Serve immediately.
