Preheat your oven to 350°F (175°C).
Grease a mini muffin tin.
In a bowl, mix the flour and salt. Add the chilled butter and work it in with your hands (or a pastry cutter) until the mixture resembles coarse crumbs.
Slowly add ice-cold water, one tablespoon at a time, mixing until the dough holds together.
Roll out the dough on a floured surface and cut circles to fit your mini muffin tin.
Press the dough circles into the cups, pricking the bottoms with a fork to prevent puffing.
lace the tin in the fridge while you make the filling.