In a large bowl, combine flour, salt and sugar. Chop 2/3 cup butter into small cubes and the remaining 1/3 cup into 1/4-inch slices. Blend in the cubed butter into the flour mixture with a pastry blender
until only pea sized chunks remain. Work sliced butter into the mixture with your fingers, leaving varying sizes of butter pieces throughout. Mix in enough water to hold dough together. Divide dough in half, pressing and shaping into discs. Cover in plastic wrap, chilling for at least 1 hour, or longer as needed.