Bishop's Pudding and Sauce

For pudding:
1 c. chopped nuts
1 c. sugar
1 c. chopped dates
1 tsp. baking powder
1/8 tsp. salt
3 eggs

For sauce:
1 c.sugar
2 T. water
1 T. vinegar
2 T. butter

Mix sugar, baking powder, and salt. Add dates, nuts, well beaten eggs. Bake in a flat pan, 8 or 9 inches square, slowly for 45 minutes. When cold, cut in squares. Place a heaping tablespoon of vanilla ice cream on each square. Serve with hot sauce. For sauce: Cook together ingredients for 3 minutes.