In a large bowl, mix cold butter, flour and salt until the butter is reduced to pea-sized chunks.
Add ice water 1 tablespoon at a time just until the dough starts to come together.
Shape the dough into a thick disk, cover, and refrigerate for at least 1 hour.
Once chilled, preheat the oven to 375ºF. Roll out the chilled dough to about 1/8-inch thick.
Cut out 4 small rounds just slightly larger than the tartlet dish and form to the shape of each dish, cut off any excess.
Prick the bottom of each pie shell a few times with a fork and refrigerate 20 minutes or freeze for 10 minutes.
Remove the pie shells from the refrigerator, gently cover with parchment paper, and fill with pie weights if you have them. Bake for 10 minutes