Tucked inside a 1927 dining car, this restaurant, which opened in 1999, was at the forefront of the cool culinary landscape that is now Williamsburg. Diner serves simple seasonal fare; the menu changes daily, and your waiter will scrawl it on your paper tablecloth to help you remember. It's more upscale than the name implies but still casual. Expect dishes like a juicy veal chop with butternut squash or braised beef tongue on a baguette. Save room for the intense flourless chocolate cake.