Tucked away on a bustling street in Delaware, Ohio sits an unassuming brick building that houses what might be the Buckeye State’s most perfect mushroom Swiss burger – the Hamburger Inn Diner.

For those seeking something with Mediterranean flair, “The George” features house loukaniko Greek sausage, peppers, caramelized onion, garlic, topped with feta and oregano – a combination that might ...