Well I never!
The next day somebody came in and ate a burger and was like, 'That's the best burger I've ever had in my life!'" Fast forward to 2022 and believe it or not, Dyer's Burgers not only still exists, but the burgers are still cooked in the original grease that made the restaurant famous more than 100 years ago
But if the idea of eating century-old grease doesn't sit well with you, Robertson assured us that it's perfectly safe. "We strain it through to get any particles out of it and then we season it," he explained. "It's the same molecules from 1912, it's never been changed." Something else that hasn't changed is the way the burgers are served. "We only do mustard, pickle, onion and pepper. We don't even carry lettuce, tomato, or any of that, that's the way they come," stated Robertson. And don't ask him what the special seasoning is made of.
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That whole linked article is worth a read.