GOOD TASTES FALL'S SWEET ENDINGS By Marlene Sorosky HERE'S SOMETHING ROMANTIC ABOUT DESSERTS. POETS AND LYRICISTS WRIIE ABOUT THEM. LOVERS WOO WITH THEM. COOKS DESIGN MEALS AROUND THEM. DI ETERS FAST ALL DAY FOR JUST A BITE. DEL CIOUS AND DECADENT, DESSERTS EVOKE PASSION, AROUSE ARDOR, ELICIT GUILT THE CROWNING FINALE TO A MEAL, THEY ARE SAVORED AND SWOONED OVER. AND ANY DESSERT LOVER WILL TELL YOU, FRUIT IS NOT DESSERT. UN- LESS, OF COURSE, IT IS ENCRUSTED IN PASTRY, SCENTED WITH SPICES, FLOATING IN CUSTARD OR BAKED IN A CAKE. FOLLOWING IS A SAMPLING OF FALL DESSERTS FASHIONED FROM FRUIT TO SEND HEAR7S THROBBING. JUST IN TIME FOR THANKSGIVING, THE ALLURING HARVEST PATCHWORK CAKE IS AS HOMEY, COMFORTING AND ATTRACTIVE AS A SNUGGLY QUILT, ITS PATCHWORK DESIGN CREATED WITH AL7EI?NATING SPOONFULS OF CHEESECAKE AND CARROT-PUMPKIN BAT I ERS. CINNAMON-SCENTED APPLE CAKE IS MOISTENED AND FLA- VORED WITH APPLESAUCE AND SPRINKLED WITH SUGAR AND SPICE AND OTHER THINGS NICE, LIKE JUICY DARK RAISINS. Fruit-fillcd finales to arouse the passions of even the most experienced dessert lover.