01 - 
                Combine chili powder, onion powder, salt, cumin, garlic powder, black pepper, cayenne and paprika in bowl.
              
              
              
                02 - 
                Whisk beef broth and tomato paste together.
              
              
              
                03 - 
                Place roast in slow cooker. Rub spice mixture all over meat.
              
              
              
                04 - 
                Pour broth mixture over the seasoned meat.
              
              
              
                05 - 
                Cover and cook on low 8 hours until fork tender.
              
              
              
                06 - 
                Remove meat, shred with forks discarding fat. Return to pot with lime juice.