Place cottage cheese in container of an electric blender; process until smooth. Set aside.
Beat eggs in a medium mixing bowl until thick and lemon colored; add sugar and flour, beating until well blended. Add cottage cheese, sour cream, butter, lemon rind and juice; beat until smooth.
Pour cheese mixture into pastry shell. Bake at 350° for 45 minutes or until a knife inserted in center comes out clean. Garnish with orange slices, if desired. Serve cheese pie warm or chilled.