That Burger Tent might be something you either roll your eyes at or go gaga for, depending on your tolerance for trends. Let's count 'em: 1) burgers 2) Pat La Frieda burgers 3) pop-up food vendor 4) located at a hipster flea market. But even the most cynical burger-eater out there would have to give it up for burgermeister Dan Petersen's little burger operation, located just outside Williamsburg's Artists & Fleas on North 7th Street, near East River State Park. These burgers are all that. More