Heat oven to 350 degrees
In a large mixing bowl combine flour, 1 1/2 c sugar, baking soda, and 1/2 tsp peel.
Using pastry blender cut in chilled butter and the egg until the mixture resembles coarse crumbs.
Reserve 2 cups of flour mixture.
Press remaining flour mixture evenly into ungreased 15 1/2 x 10 1/2 inch jelly roll pan to form base.
Bake for 8 minutes