Maybe it's because tiramisu tastes so sinful that stories linger about this Tuscan trifle being so popular with Italian whores, who used it as their "pick me up" (the English translation of tiramisu) between clients. Or maybe it's because Eye-ties tend to be rather sensual. After all, are there any Fellini films that do not feature prostitutes? Heck, we know we'd turn tricks in Rome for just one goblet of Scottsdale trattoria Radda's tiramisu. It's the creation of chef Lori Hassler, who runs the hip little spot along with her band of youthful restaurateurs, and since we tasted Hassler's tiramisu late last year, it's become the yardstick by which we judge all others. Could it be the savoiardi (ladyfingers) dipped in strong coffee, espresso and amaretto? Or the made-from-scratch cream of mascarpone, eggs, sugar and Marsala? All we know is it tastes so delightful served in those bulbous wineglasses that many a nosher has been known to swipe them from the premises! Egad, and we thought our collection was going to be one of a kind.