Method
Turn on the oven to 200ºC.
Fry the bacon and leeks.
Add the drained and rinsed butter beans.
While this is cooking, cook the pasta until soft in a large saucepan of boiling salted water.
Place the bacon mixture in the bottom of a lasagne or pie dish.
Drain the pasta and pile on top.
In a measuring jug, mix together the milk, grated cheese, nutmeg and crème fraîche. Pour over the pasta.
Bake for approximately 10 minutes until golden brown. Garnish with parsley before serving.