Preheat over to 375 degrees. Mix shortening, butter, sugar, egg yolk and vanilla. Sift together flour and salt. Mix. Roll dough into 1 inch balls. Dip slightly in beaten egg whites and roll in nuts. Place cookies one inch apart on ungreased cookie sheet. Bake 5 mins. Remove from oven. Press in Hershey Kisses. Return to over and bake 8 minutes longer.
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