To prepare marinade, combine the cornstarch, syrup, soy sauce, ginger, vinegar and garlic. Cut the spareribs into serving pieces and place in a single layer in shallow dish. Pour marinade over meat, refrigerate 4 hours or overnight. remove the spareribs from marinade, season with salt and pepper. Place in shallow baking dish, cover with aluminum foil. Bake in 350ºF. oven for 1 1/2 hours. Remove foil. Broil 5 inches from heat. Turn once and baste frequently with sauce.