In a food processor, combine crushed crackers, cashews, and granulated sugar. Cover and pulse several times to form fine crumbs. Add melted butter, and cover and pulse several times to combine. Press mixture onto bottom and up sides of a 9-inch pie plate. Bake for 8 to 10 minutes or until fragrant and firm. Cool on wire rack. Note: If desired, gingersnap crumbs may be substituted for graham crackers, and pecans may be used instead of cashews, as per original, very old recipe.