Bring prune juice to a boil in a medium saucepan; cook over medium-high heat for 20 minutes or until reduced and thickened. Stir in honey, cornstarch mixture, butter, cinnamon and cloves. Cook over medium heat, stirring constantly, until very thick; set aside. Preheat oven to 375°F. Stir apples and prunes into sauce mixture and transfer to a 2 quart baking dish. Combine flour, sugar and baking powder in a medium bowl. Mix in butter with your fingers until incorporated; sprinkle over apple-prune mixture. Bake for 30 minutes. Serve warm, with ice cream, if desired.