It's somewhat of a secret, but they have the best burger in the 'burgh. Like everything else here, it's unoriginal, plain-jane American - but executed perfectly. The Union Grill is probably the most honest, most comforting, most down-to-earth, American restaurant I've ever been in. All of the food comes in ridiculously large pittsburgh-portions - and it's pretty much all great. They also have Pierogies so you can show your friends a Pittsburgh tradition. They have sidewalk seating - so on the 4 days a year when it's pleasant outdoors - you can enjoy it. Lastly, they have pretty cheap, pretty decent wine by the glass. A glass of cheap red goes great with those burgers.