Preheat your oven to 350°F (175°C). Grease and flour a mini muffin tin.
In a bowl, mix the flour and salt. Add the cubed butter and use your fingers or a pastry blender to work it into the flour until it resembles coarse crumbs.
Slowly add the ice-cold water, one tablespoon at a time, mixing until the dough just comes together. (Don’t overwork it, or you’ll lose that flaky texture!)
Roll out the dough on a lightly floured surface and cut into small circles to fit into your mini muffin tin.
Press the dough circles into each muffin cup, forming little crusts. Prick the bottoms with a fork to prevent puffing.
Pop the tin in the fridge while you prepare the filling.