Look for lemon curd on the jam and jelly aisle of your supermarket.
Beat first 5 ingredients at low speed with an electric mixer 30 seconds or just until moistened; beat at medium speed 2 minutes. Pour batter evenly into 2 greased and floured 9-inch round cake pans.
Bake at 350° for 20 to 25 minutes or until a wooden pick inserted in center comes out clean. Remove from pans immediately; cool layers completely on wire racks.
Combine preserves and lemon curd. Spread 3/4 cup filling between cake layers; spread remaining filling on top of cake. Spread frosting on sides of cake; gently press coconut evenly onto sides of cake. Garnish, if desired.