Rinse ham hock and bring to boil in large covered pot. Reduce heat to simmer and let meat cook for 2 hours. Add additionally water as necessary.
Thirty minutes before the ham hock is ready, wash the greens thoroughly. Remove greens from the stems. Stack the greens and roll them up. Using a cutting board and knife cut leaves into 1 inch thick strips.
Add greens, bouillon cube, onion, and sugar to the pot. Bring water to bowl. Reduce heat to simmer and cook for 1-2 hours until greens are tender. Stir your greens often. Add salt and pepper to taste. Serve.