Place a small saucepan, over moderate heat and add butter. Work close to the stove and add apples and pear to the pot as you chop them. Sprinkle the fruit with brown sugar, a teaspoon of lemon juice and nutmeg. Add cider and raise heat a little. Allow liquid to come to a boil, then add cranberry sauce to the pot. When sauce returns to a boil, turn heat back to moderate, and cook sauce 5 minutes until apples and pears are softened but sauce remains fairly chunky in consistency. Spoon the warm fruit sauce over pound cake slices and top with scoops of vanilla ice cream.