If you happen to be one of the lucky few who can get truly fresh jumbo shrimp or prawns, your pre-prep preparation for cooking the jumbo shrimp is simply to rinse them off. If the she shrimp have freshly molted, you don't even need to remove the shells. If the shells are not so new and are too thick for your liking to eat, then shell the shrimp and perhaps 'devein' them and you are ready to go!