NYT Cooking: This is the traditional, griddled hamburger of diners and takeaway spots, smashed thin and cooked crisp on its edges. It is best to cook in a heavy, cast-iron skillet slicked with oil or fat, and not on a grill. For meat, ask a butcher for coarse-ground chuck steak, with at least a 20 percent fat content, or grind your own. Keep it in the refrigerator until you%2...
