Cook the meat with the garlic and onion in enough water to immerse them.
Toast, hollow out and soak the chiles (approximately 5 minutes). Liquefy them in in a food processor or blender along the water they soaked in.
Strain the sauce from the chili into the pot in which the meat is cooking. Add 3 small bay leaves, cumin, salt and pepper. Simmer until the meat is well cooked.