1. Preheat oven to 375F. 2. Cook the potatoes unpeeled until tender throughout. 3. Let cool, Peel and mash the potatoes, then stir in melted butter. 4. In a bowl, beat the eggs, add sugar. 5. Add milk, vanilla, molasses, salt, cinnamon, nutmeg, cloves and orange zest. 6. Beat until well blended. 7. Stir into mashed sweet potatoes, then mix until well blended. 8. Place the mixture into a buttered 1-1/2 quart baking dish. Optionally, you may sprinkle the top of the pone with additional brown sugar. 9. Cover with foil and bake for 50 minutes; uncover, then bake for 10 minutes. Allow the pone to cool completely before serving.