Place the beef cheeks in a dish, cover with ½ a cup of the aliños sauce, then let marinate for at least 6 hrs, or overnight.
Place the beef cheek pieces in a pot. Add the aliños sauce, tomato sauce, beef stock, salt, pepper, cumin powder and bring to a boil. Cover and reduce the heat to medium-low, cover and let it cook for about 2 hours.
Add the potatoes and carrots. Cover and cook for an additional 30 minutes or until the beef cheeks, potatoes and carrots are tender. Serve with white rice.