Grub Street has been obsessed with the New York dining scene for almost three years and nearly 10,000 blog posts. But we also know that there’s a world of cuisine beyond New York City, and a very robust one at that. So we’re expanding our horizons across five more Grub Streets in Los Angeles, Chicago, San Francisco, Boston, and Philadelphia — cities where, not coincidentally, New York Magazine’s sister company, MenuPages, has a local site. We’re also launching a national homepage at GrubStreet.com, which will feature the best stories from all the local blogs, over 400 chef and recipe videos, and over 600 recipes. This week, we’re introducing the Burger Register, a definitive, drool-inducing catalogue of more than 200 of America’s most notable burgers, complete with vital statistics; a look at the Neapolitan-pizza trend (it’s not just in New York!); a Chicago Diet with Top Chef’s Stephanie Izard; interviews with Mr. Chow in L.A. and Nate Appleman in San Francisco; and a survey of the five toughest reservations in the country. (Turns out one of the three toughest tables is in Pennsylvania.) Pull up a chair, unfold your napkin, and dig in.