Line a 23 cm quiche dish or pie pan with pastry; trim off excess pastry around edges. Place a piece of buttered aluminum foil; buttered side down over pastry, gently press into pastry shell. Cover foil with a layer of dried peas or beans. Bake at 200ºC or 10 minutes; remove peas and foil. Prick shell and bake 3 to 5 minutes or until lightly browned. Cool. Combine milk, mayonnaise, eggs and cornstarch; mix until smooth. Stir in remaining ingredients. Pour mixture into quiche shell. Bake at 180ºC or 40 to 45 minutes or until set. Yields one 23 cm quiche.