Mercadito Cantina: This is newest advance in the expanding Mercadito empire; besides the original Alphabet City Mercadito there’s also Mercadito Grove. This one is not far from the original, on Avenue B, and packs a lot of Mexican fixings into a dainty space that stays open ‘til 1 a.m. The main action here is at the make your own taco bar, where heavy rollers can choose from eight guacamoles and ten salsas, all made from......