Ingredients
Method
- Melt the butter, stir in the flour for 1 minute, then whisk in the milk and cook until thick. Season with nutmeg and salt.
- Spread two slices of bread with mustard. Top with ham and half the Gruyère, then the remaining bread.
- Toast the sandwiches in a buttered pan for 2 minutes per side.
- Heat the grill. Spread the béchamel over the tops and scatter with the remaining cheese.
- Grill for 3–4 minutes until golden and bubbling.
Notes
Make it a croque madame by topping each sandwich with a fried egg.