Preheat oven to 375º. Sauté leeks in butter over low heat until soft. Add sausage and continue to cook for 2 to 3 minutes. Spread cheese over bottom of crust. Spread leeks and sausage over the cheese.

Whisk together eggs, cream, salt and nutmeg. Pour over leeks and cheese and dot with butter. Bake 30-40 minutes until tart is puffed and golden or until knife inserted in center comes out clean. Makes 4-6 servings.