Remove the stems from greens. Wash leaves well by placing them in a sink full of water. Drain water, rinse sand from the sink, and repeat several times until the water is clear.
Bring large pot of water to a boil. Add greens and boil for 2 minutes. Drain and throw away the water.
Bring a fresh pot of water to a rolling boil. Add salt pork, smoked bacon, chopped onions, and Tabasco. Add greens, cover, reduce heat, and simmer for 1 to 2 hours or until tender.
Add salt and pepper to taste.