In a food processor put all the ingredients for the crust and process until the dough comes together. If you don’t have a food processor mix all the ingredients together by hand.
Put the dough to chill in the fridge, while you prepare the filling.
Clean the leeks and finely chop them.
Sautee in a medium pan over medium heat until soft.
Add butter, salt, and pepper, and cook for another 2 minutes.
Let cool slightly.
Meanwhile, preheat the oven to 200 degrees Celsius.
Bring the dough out of the fridge and let sit on the kitchen counter for 5-10 minutes.
Roll it with a pin, wide enough to cover the bottom of a 20 cm pan and hang a bit on the edge.
Pierce it with a fork and put in the oven to bake for 10-12 minutes.
In a big bowl beat the eggs with milk, until well combined.
Add the cheese and mix again.
Bring the pan out of the oven and add the leeks.
Add the eggs, milk and cheese mixture on top.
Season with pepper and nutmeg and put in the oven to bake.