La Papa Astoria (CLOSED)

This Turkish joint specializes in the kumpir—a dolled-up baked potato, apparently a fast-food staple in Istanbul. For a mere $6, you can score a sizable spud, sliced and mashed with kasseri—a creamy Greek cheese—butter and olive oil, and dressed with an unlimited amount of toppings, from the tame (roasted peppers, bacon bits, olives) to the outlandish (artichokes, sliced beef franks, tuna salad).