Place a pot over medium-high heat. Add the beef broth, ground cumin, ¼ cup of aliños and sazón. Stir to combine. Reduce the heat to low and simmer for 15 minutes.
While the broth is simmering, make the meatballs: In a medium bowl, combine all the meatball ingredients and using your hands, mix well until combined.
Divide meat mixture equally into 12 portions and roll into balls with your hands. Place in a plate and set aside.
Add the meatballs to the broth. Simmer for 20 minutes, add the rice and vegetables and cook for 20 minutes more. add more broth or water if necessary. Stir in the fresh cilantro and top with avocado. Serve warm.