4 oz Unsweetened chocolate

    1/2 c  Butter or margarine

      2 c  Sugar

      4    Eggs; beaten

      1 c  Sifted flour

      1 ts Vanilla

      1 c  Coarsely chopped walnuts

      6 oz Semisweet chocolate pieces

  Melt unsweetened chocolate and butter in top of double boiler over hot
  water. Cool slightly. Gradually add sugar to eggs, beating thoroughly after
  each addition. Blend in chocolate mixture. Stir in flour. Add vanilla, half
  of nuts and half of semisweet chocolate pieces. Spread in greased 9-inch
  square pan. Sprinkle remaining nuts and chocolate pieces over batter. Bake
  at 325F 30 minutes. Remove and cool in pan. Cut in squares.