Combine flour, salt and cold butter in a food processor or by hand until you have a crumbly dough.
2
Dilute with cold water until you have a perfectly smooth dough.
3
Let the dough rest in the fridge for about 20 minutes.
4
Roll the dough out on a baking sheet and place it on a baking tray. Use a fork to pierce the dough several places across the bottom to allow air to escape while cooking.
5
Pre-bake the dough at 200 degrees celsius for about 10 minutes. Prepare the other ingredients.
6
Chop red onion, cherry tomatoes and basil.
7
Whisk together eggs, milk, salt and pepper and grated mozzarella in a bowl. Then add the chopped vegetables.
8
Take the pie crust out of the oven and pour the egg-mixture into it. Bake for about 25-30 minutes.
