Let's face it, most diets do not end in less inches and more dates. More often they end with a chair being pulled up to anything with frosting. And if you're going to do it, you might as well do it right, which means Capitol Hill's Dilettante Mocha Cafe and Chocolate Martini Bar. A good sign that you're in the right place is that the menu of savory dishes is quite dainty, a mere afterthought to the main attraction?the extensive list of tortes, cakes, cheesecakes, and pastries. And these are no sissified slivers of cake: You're basically given a slab?or in the case of their sundaes, a trough?to dig into. Plus, the waiters don't insult your downward spiral by imagining that you intend to share with your companion. They're more likely to suggest the possibility of adding a chocolate martini. To which you say, "Hey, I've fallen this far off the wagon, might as well take it all the way." Then at the end of the "meal," in a semi-cruel twist, they give you one of their delectable truffles with the check. And even though you're nearing a diabetic coma, you eat it. Diet successfully destroyed.?Suzie Rugh