PREHEAT oven to 350°F. Place onion, cilantro, tapioca, eggs and taco seasoning mix in food processor container fitted with steel blade; cover. Process using on/off action until finely chopped. Add beans; cover. Process, using on/off action, until beans are finely chopped. Place in medium bowl.
ADD meat and 1/2 cup of the salsa; mix just until blended. Shape into oval loaf in shallow baking pan.
BAKE 1 hour 15 minutes or until cooked through. Top with remaining 1/2 cup salsa.