In a medium bowl, mix ½ cup of the brown sugar into milk, then add the chopped dates and prunes. In a small bowl, mix flour, baking powder, and allspice, then incorporate into fruit mixture. Spread evenly into the bottom of an ungreased 9-inch square baking dish and sprinkle nuts on top.
In the now-empty medium bowl, combine remaining ½ cup brown sugar with white sugar and salt. Mix vanilla and boiling water into sugar mixture until sugar is dissolved. Pour mixture over the nuts. Bake at 350 F for 50 to 60 minutes, until bubbly and slightly jiggly. Let cool for 10 minutes before serving. Top with whipped cream, if desired. Store leftovers in the refrigerator and reheat in microwave.
Per serving: 375 calories, 5.5 grams fat (0.5 gram saturated fat), 2 milligrams cholesterol, 406 milligrams sodium, 79 grams total carbohydrates, 3 grams fiber, 5 grams protein.
