Preheat oven to 220°C.

TO MAKE THE SAUCE
Melt butter in a saucepan over medium heat. Whisk in flour and cook, stirring constantly, for about 3 minutes.
Gradually add milk, stirring well until the mixture is smooth. Cook, stirring, until sauce is thickened.
Season with a little bit of salt and pepper.
Remove from heat and stir in mustard, nutmeg and a third of the grated cheese.

Place 4 slices of bread on a baking tray
Use half of the béchamel sauce to spread on 4 slices of bread, all the way to the edges.
Top each with a ham, and a handful of grated cheese.
Place remaining slices of bread on top, and top with béchamel sauce and the remaining grated cheese.
Bake at 220° C for about 5 minutes, until the cheese is melted. Change the oven to grill and grill until the cheese on top is golden, 2-4 minutes.

Recipe supplied by NZ Pork