In some kind of kitchen machine (or by hand) mix butter, flour, salt, quark and water into a dough.
When texture feels right (no lumps of butter etc.) use your thumbs to cover a pie tin with the dough.
When you're done (don't forget the edges) put in the fridge for 30 minutes. The pre-cook it for 10 minutes at 225 degrees C.
Mix the eggs..
with the milk.
..and the quark.
Add black pepper and salt.
Fill the pie with leek,
smoked ham and grated cheese.
Pour the egg mix on top.
Put in the oven for 25-35 minutes (again at 225 degrees C).
Let it cool somewhat...
..and then serve it with a salad.