My family has been going to Tessaro's since the 80's and it's a staple in Pittsburgh for a reason. All the food is really great, the service impeccable, and the ambience top notch. Burgers are their forte but the other options are just as good.
Check the fish specials on the big board to the left as you walk in. My personal favorite, the Chicken Kebab with blackened chicken and potatoe salad.
PRO TIP: Also get the broccoli grilled. Phenomenal.