Preheat oven to 400 degrees. If using frozen shell, bake at 400 degrees for 5 m inutes to prevent crust from becoming soggy. Cool. Saute shrimp, scallops and o nion in 1 tablespoon butter and 1 tablespoon sherry until cooked. Set aside to cool. Drain . Make filling by beating eggs with half and half, milk, flour, sal t and nutmeg. Melt remaining butter and whisk into filling. Spoon seafood mixtu re into crust and sprinkle with 3/4 of the Swiss cheese. Pour filling over chee se. Sprinkle with remaining cheese. Bake 15 minutes at 400 degrees then 40 minu tes at 325 degrees until knife inserted in center comes out clean. Recipe from "One Million Recipes CD" busted by Judy R.