Wash and dry the potatoes. Grease the outside of the potatoes with shortening then sprinkle all over with Kosher salt. Bake in 350° oven about an hour or until done. Remove from oven. Slice off about 1/4" or so from top, leaving most of the potato intact. Scoop the potato pulp being careful not to knock of the salt from the outside. Mash the potatoes with butter and sour cream. Add the salt and pepper to taste and the cheese. Fold in the crab meat and also the shrimp that you have sauteed earlier. Fill potatoes with this mixture and you can top with more cheese. Put these back in oven for about 15 minutes right before serving time. Garnish with chopped chives.