How to Make It
Preheat the oven to 375°. In a large skillet, melt 1 tablespoon of the butter. Add the apple wedges and cook over moderate heat, stirring frequently, until golden, about 3 minutes. Scrape the apples into a large bowl.
Add the remaining 1 tablespoon of butter to the skillet. Add the plums and cook over moderate heat, stirring, until just tender, about 3 minutes. Pour off and discard any juices.
Return the apple wedges to the skillet. Add the raisins, brown sugar, cinnamon, allspice and cloves and stir over moderately high heat to melt the sugar. Add the rum, stir well and scrape the fruit back into the bowl; let cool.
Place a sheet of phyllo dough on a work surface with a long edge in front of you and brush the phyllo with some of the melted butter. Continue layering with the remaining 7 sheets of phyllo dough, buttering between each sheet. Spoon the apple-plum filling in a strip that is parallel to and about 2 inches from the long edge of the stacked phyllo sheets. Lift the long edge up and over the fruit filling, then roll up the strudel, pushing in the sides as you go.
Transfer the strudel, seam side down, to a baking sheet and brush with the remaining melted butter. Using a serrated knife, make 4 diagonal cuts in the top to allow steam to escape as the strudel bakes. Bake until the phyllo is golden brown and the filling is starting to bubble, about 35 minutes. Let the strudel cool slightly, then slice and serve with vanilla ice cream.