Until today, Belltown was the last neighborhood in Seattle without a pho parlor. No longer. Black Bottle, that estimable watering hole for the the Under 30 set, is now serving an elegant pho made with beef brisket that's braised to medium-rare, then roasted to order. The lean and fatty bits--and it's a huge amount of meat--meet up in the broth, and pho, of course, is all about the broth: beef bones, star anise, rock......