Because sometimes you don't want another standby roast turkey or chicken salad sandwich for lunch. Sometimes you want something somewhat off the beaten path. And when you're feeling a little adventurous step right up to Mary Mervis at Lexington Market, which offers, in addition to the usual array of deli sandwiches and subs, a board of specialty sandwiches far removed from the froufrou designer sandwiches with sprouts and "Southwest" in their names. Take the Wall Street Turkey ($7.50), for instance: Sizable layers of matte-white smoked turkey breast, flesh-hued beef tongue, and dark-red chopped liver are squeezed between two pieces of mayo- and mustard-swathed wheat bread and topped with shredded lettuce, onion, and thick-cut tomatoes. Yes, it's too big to eat with your hands--but there's really no other way to eat it, so be sure to thank the affable counter servers for the fistful of napkins they shove into your bag because some of that lettuce and mayo is headed for your lap. Two bites in and your usual sandwich just won't sound as appealing again. Plus, you're probably getting your week's supply of vitamin A and iron.