To the bottom of the slow cooker, add the onions, garlic and bay leaves.
Trim extra fat from beef cheek. Season , to taste, with salt, pepper. Place in slow cooker.
Fill with water halfway. Cook on high for 6 hours or on 8 hours on low overnight. Remove from crock pot and place into a serving dish. It should shred easily with two forks.
For more flavor, mix in the onions and garlic to the beef cheek. Also mix in 1/2 cup of the broth to the meat. Serve with warm corn tortillas, diced onion, chopped cilantro, your favorite salsa and lime wedges.