To prunes, add 1/2 cup water and soak 10 minutes. Simmer in same water until tender (about 10 minutes). Drain prunes and mash to a pulp. Mix flour, baking powder and salt. Add beaten egg and milk. Mix to a dough. Roll out thin, spread with prune pulp, sprinkle with two tablespoons sugar. Roll the mixture and place in greased baking dish. Bake 30 to 40 minutes. Take half cup of juice from prunes, add 1 tablespoon corn syrup. Bring to boiling point. Serve as sauce for prune roll.