1/2 c. butter
1 c. sugar
2 eggs, separated
1 c. raisins or dates
1 c. nuts
1/2 tsp. vinegar
1 tbsp. vanilla

Cream butter with sugar. Add egg yolks then raisins, nuts, vinegar and vanilla. Beat egg whites stiff and fold into mixture. Bake in pie shell 45 minutes in moderate oven.