Tesla’s diner is well suited for those fans in so deep it’s “like a cult,” Greenspan says—but the goal is to feed something bigger. “What makes a diner is hospitality,” he says. “It needs to feel comfortable, welcoming, and that’s really hard to do in a quick-service environment, especially when we’re serving you in your car.”

I don’t own one of Elon Musk’s cars, and chilli cheese fries aren’t part of my daily diet. But I admit I was smiling as I left his new restaurant.