I love the guys at the A+S Pork Store, but there's no getting around it: Union Market has some *incredible* meat. The marbling on their beef is off the charts -- definitely the high end of prime. Even their lamb has more marbling than you'll find at most butcher shops. When I'm walking by, I stop in sometimes just to gawk at the meat case, even if I'm not gonna buy anything -- it's that impressive.
Fortunately, the Pork Store's still the place to go for mozzarella, pizza rustica, and sandwiches.