01 - Whisk together flour and salt in a large mixing bowl.
02 - Add cold butter cubes and use a pastry blender or fingertips to work them into the flour until the mixture resembles coarse crumbs with pea-sized pieces.
03 - In a small bowl, beat the egg with 2 tablespoons of ice water.
04 - Drizzle the egg mixture over the flour and butter, gently mixing with a fork until the dough begins to come together. Add up to 1 additional tablespoon of ice water if the dough feels too dry.
05 - Transfer dough to a lightly floured surface, press together, shape into a flat disc, wrap tightly in plastic wrap, and refrigerate for at least 1 hour.
06 - Roll out chilled dough on a floured surface to fit a 10-inch tart or pie pan, then proceed with desired savory filling.