Scrub and rinse oysters thoroughly in cold water; drain.
Pour water into a large stockpot with a steaming basket to come 2 inches below basket. Add salt; bring to a boil.
Place oysters in basket; cover and steam 10 minutes or until shells open. Drain.
Using an oyster knife, remove top shell and loosen oyster meat. Place oysters on the half shell on a large serving platter. Serve with melted butter or cocktail sauce.