In a large bowl combine beef, onions, beans, and cumin and mix well. Divide into 4 portions and form into ½-inch thick patties. Season both sides lightly with pepper.

Cook burgers on a preheated grill for 8 minutes per side for medium rare or about 12 minutes per side for medium or longer depending on desired doneness.

Remove from grill and let rest for 5 minutes.

Place each burger on a ciabatta roll with 2 tablespoons each mashed avocado and Pico de Gallo.

TIP: When making burgers, remove the ground meat from the fridge about 20 minutes before forming into patties. Resist the urge to over handle while trying to form perfect-looking burgers. Over handling will cause the meat to toughen.