Preheat oven to 325°F. Place ham, cut-side down, in large roasting pan. Pour stock into pan.
Mix red pepper jelly, orange peel and juice, and spices in small bowl until well blended. Brush 1/2 of the pepper jelly mixture over ham, gently separating the slices so glaze can reach middle of ham. Cover loosely with foil.
Bake 1 hour, basting occasionally. Remove foil. Brush with remaining pepper jelly mixture. Bake 45 minutes longer. Serve ham with pan drippings.