Preheat oven to 350°. Combine first 4 ingredients in a large bowl; cut in butter with a pastry blender until crumbly. Toss in almonds; reserve 1 cup flour mixture. Press remaining flour mixture onto bottom of a lightly greased 13- x 9-inch pan.
Bake at 350° for 15 to 20 minutes or until lightly browned. Spread lemon curd over crust, leaving a 1/4-inch border. Sprinkle with ginger and reserved flour mixture. Bake 15 to 20 minutes or until lightly browned. Let cool 1 hour on a wire rack. Garnish, if desired.