Ingredients
3 small leeks, sliced
handful of ham, sliced
25g plain flour
25g butter
400ml milk
75g cheese, grated
2 tsp mustard powder
1 bay leaf
Salt & Pepper
250g puff pastry
2 tbsp milk or 1 beaten egg
Method
Preheat oven to 180C Fan.
Gently fry off the leeks in a small amount of butter until softened, stir in the ham then take off the heat while you prepare the sauce.
In a saucepan melt the butter then whisk in the flour. Keep whisking for a minute to cook the flour. Slowly add the milk and whisk until you have no lumps. Add the bay leaf
Gradually bring the sauce to the boil, stirring all the time to stop it burning. Simmer the sauce until it has thickened. Take off the heat, remove the bay leaf then stir in the cheese and mustard powder. Season then add to the leeks & ham.
Pour the cheesy leek mix into the bottom of a deep ovenproof dish. Roll out the puff pastry to the size of the dish. Place the pastry on top of the leeks and place 2 slits in the pastry (this stops the pastry going soggy). Brush the pastry with either the milk or eggs then bake for 25-30 min, until pastry is risen and golden.