In a large stock pot, combine the chicken broth, Pit Boss Sweet Heat Rub, sliced onions, garlic and ham hocks. Cover and simmer for 2-3 hours, or until the ham hocks are tender. Allow to cool.
Remove the meat from the ham hocks and chop. Add the collard greens to the broth, fully submerged, and simmer for 30-45 minutes, or until the greens are tender.