How to cook
Grind the butter with the flour until it forms into buttery crumbs. Add a little cold water so that a soft dough forms, which you need to leave in the refrigerator for a short while to rest.
Meanwhile, heat the olive oil in a deep frying pan and saute the sliced leeks until they soften. Add the diced bacon and sliced mushrooms.
Fry until the mushrooms are ready. Season the products with black pepper, paprika and as much salt as you like.
The butter dough is spread on the bottom and walls of a pre-greased pie tin. Spread the filling evenly on top. Pour the well-beaten eggs and milk on top.
The quiche is baked in a preheated oven at 392°F (200 degrees) until the edges of the dough are browned.
Shortly before the end of baking, you can sprinkle the quiche with grated yellow cheese and bake it only on the top rack of the over or grill it until the yellow cheese has baked nicely.