Line a baking sheet with parchment paper. Set aside.
Mix flour and salt in a large bowl. Grate cold butter on a cheese grater, or cut it into very small bits. With a pastry cutter or clean, cold fingers, crumble the butter into the flour until integrated and the butter is the size of small peas.
Sprinkle cider vinegar over the mixture and stir with a fork. Add ice-cold water, a little at a time (strain out the ice before adding to the dough), and blend with a fork until the dough is moist enough to roll into a ball, but not too wet. Roll into one large ball for the crostata and a smaller ball for another use. Note: We love to make cinnamon-cardamom roll-ups with the leftover dough.
Roll the larger dough ball out on a floured cloth or board into a circle about 14 inches in diameter. Place the dough onto the prepared baking sheet.