"Saving the world, one burger at a time" is the motto at this cheerful lunch truck parked in Williamsburg. Grass-fed Angus beef and Wagyu (American Kobe) burgers are under $10, and excellent Belgian-style frites are $3. Top your burger with extras like applewood-smoked bacon or garlicky guacamole; there's a good selection of cheeses, too—Gruyère, goat, cheddar, Brie and blue. The wait can be long during the lunch rush, so plan accordingly. Closed Sun.–Tues.