McDLT was a cheeseburger that was served at McDonald's in a Styrofoam container that split between the meat and the vegetables and sauce. Tomato and lettuce were the selling points of this menu item. This is the case because you gotta keep the cool, cool. And the hot, hot. MCDLT! MCDLT! Cool Crisp Lt, Hot Beefy McD. MCDLT! MCDLT!