Place 200g cheese, a large knob of butter, 2 teaspoons Worcestershire sauce, 1 teaspoon mustard, 2 teaspoons flour and 4 tablespoons of beer into a small saucepan.
Heat gently, stirring until the cheese melts and all the ingredients blend together to form a thick paste. Allow to cool slightly.
Meanwhile toast the bread under a grill on one side. Take out of the grill and turn over.
Spread the cheese mixture over the bread and return to the grill. Cook until the cheese bubbles and turns golden brown.
Notes
Nutrition information is calculated usingan online nutrition database - is approximate and is meant as a guideline only. (It does not include seasoning.)Cook's TipIf you don't have beer you can use milk instead but it will affect the overall flavour.