Tucked into a dilapidated shopping area on Federal and flanked by an impossible-to-maneuver parking lot, Pho Duy has somehow managed to keep slinging pho for nearly two decades. Every seat in the sparse dining room is almost always filled, as staffers scurry through the crowd to take orders, unceremoniously deliver dishes and then clear away the remnants just in time to seat the next group of diners coming in. Save for a few appetizers and specials, this shop simply hawks pho, which starts with dark and pungent beef broth, with depth added by slices of onions cooked soft, their flavor infused into the liquid. The boiling broth is poured over a nest of rice noodles and your choice of peppery, tender flank steak, chewy chunks of tendon, textured strips of tripe and other meaty combinations; the diner tosses in fresh basil, bean sprouts, lime and spicy sriracha to taste. So pho, so good.