For Crust, combine flour, 1/3 cup Equal and salt in medium bowl. Cut in 6 tablespoons butter with pastry blender until mixture resembles coarse crumbs. Sprinkle with 1 teaspoon lemon peel and vanilla. Mix with hands to form dough.
Press dough evenly on bottom and 1/4-inch up sides of 8-inch square baking pan. Bake in preheated 350F oven 8 to 10 minutes or until set. Cool on wire rack.
For Filling, beat eggs and 3/4 cup Equal. Mix in lemon juice, 4 tablespoons melted butter and 1 tablespoon lemon peel. Pour mixture into baked pastry.
Bake about 15 minutes or until filling is set. Cool completely on wire rack. Cut into squares.