This recipe requires a bit of extra effort, but it's worth it to impress your barbecue guests with the flavor bursting out of these brown butter-coated patties. Before the burger is put together, the recipe's brown butter needs to be prepared by letting butter heat up on the stove and separating out the browned solids at the bottom of the pan from the rest of the melted butter. By adding browned butter to the burger patty, the burgers will have a nutty flavor and will be extremely moist.