Mix together beef broth, adobo sauce, minced garlic, apple cider vinegar, lime juice, dried oregano, ground cumin, salt, pepper, and ground cloves. If using chipotles, put all ingredients into a blender and combine.
Put the beef roast in a slow cooker and pour the mixture over it. Add bay leaves. Cook for approximately 6 hours on high.
Removed bay leave and shred the beef, then place it back into the slow cooker with the mixture and stir.
Add the romaine lettuce, rice, black beans, tomatoes, guacamole, and barbacoa beef to a plate or large bowl and mix. A low carb alternative would be to leave the rice out.