Mix flour and salt in large bowl. Cut in butter with pastry blender or 2 knives until mixture resembles pea-size crumbs. Add vanilla extract and ice water, 1 tablespoon (15 ml) at a time, tossing dough with fork after each addition. Add just enough water so that dough comes together. Gather dough into a ball. Flatten into a disk. Wrap in plastic wrap. Refrigerate 30 minutes.