Tessaro's is without a doubt the best burger in Pittsburgh. Everytime they are perfectly seasoned and cooked to order. They are also huge, to the point I am full but have to finish anyways. One complaint is you can't get French fries, but the home fries are a great and different substitute.
The decor is rustic with plenty of wood booths and denim tablecloths. The staff is also very friendly and seems like they have been here as long as I have been coming here. The most amazing thing about this place is the kitchen. It us a tiny, and I mean tiny, open kitchen just behind the bar area. How they get such tremendous flavors from this kitchen is amazing but I can't complain. Also for as busy as they get, especially on weekends, they still get food out pretty quickly.
I highly recommend coming here to anyone who enjoys a good burger.