The Balkan House restaurant in Michigan had been wrestling with a pandemic related sales slump. Lately though, business is back to almost normal levels thanks to an anonymous donor. This time, though, it wasn’t money that was given. It was a billboard advertising the restaurant. It was placed at a major freeway interchange, and looks like an official ad from the restaurant. Nobody at Balkan House has a clue as to who is responsible for the clever and generous help.