Who says a burger has to be served between two buns? This recipe takes the traditional notion of the cheeseburger and turns it on its head. Instead of crumbling cheese over the patties, the feta is stuffed into the middle of a ground meat mixture. A soft pita replaces the classic bun and spicy arugula stands in for the usual slice of lettuce. The resulting dish, which is full of Mediterranean flavors, would be great for impromptu weeknight entertaining. To create a meal, serve with store-bought hummus, pita chips, and kalamata olives. Want to see the recipe? Keep reading.