Thanks to a tip from Grub Street, my boyfriend and I hurried to Grand Central on Friday afternoon to pig out on foods inspired by the new NBC show “America’s Next Great Restaurant” and have our picture taken with Bobby Flay so I could later deface it with inappropriate Sharpie drawings. The pop-up automat was serving mac & cheese, marinated chickpeas, grilled cheese, fried chicken sliders, and Spanish meatballs to preview some of the ideas presented by the would-be restauranteurs on last night’s premiere episode: Bobby wasn’t anywhere to be seen, but the meatball made up for it: Did any of you catch the show? It was especially interesting to…