Dish of the Week: Tacos Where: Tomatillo Taqueria Transplants to D.C. from the Southwest have long been asking, where are the good tacos/Mexican food? Many point to Taqueria Distrito Federal or Taqueria Nacionale. One of the best tacos that I’ve found in town is actually at Bar Pilar, with cubes of veal tongue, a fantastic spicy sauce, cilantro, and radish. Unfortunately, it’s not always on the menu. But thanks to a tip on Don…