While in Pittsburgh I was told to check out Fuel and Fuddle, which is next door. It sadly was closed. So Stacked worked instead.
They do a build your own burger with a big variety of options including a veggie patty. You check off you choices and they'll bring it all out. They also have a good variety of other choices, appetizers, sides and a good beer selection. Food was tasty and I was happy with the second choice. Service was good too, prices were reasonable.
That said ... We witnessed a small mouse wander across the dining room and nobody seemed very concerned. So I do hope that is not a regular occurrence.