2To Make Base: In a small mixer bowl, cream together 1/2 cup butter or margarine and confectioners' sugar. Blend in flour. Pat into 9X9 inch square pan. Bake in preheated oven for 5 minutes.
3To Make Filling: In a large bowl combine brown sugar, melted butter or margarine, beaten eggs, vinegar, vanilla, and raisins. Pour over base and bake in preheated oven for 35 to 40 minutes, until set.