By An Edible Mosaic
Prep Time: 10 min
Cook Time: 40 min
Make the caramelized onion.
Season the meat and shape the hamburger into patties.
Cook the burgers on a grill or stovetop, and top with the cheese.
To serve, put the burgers on the bottom buns, top with caramelized onion, arugula, and the top buns.