Cut the top off the pumpkin and remove the seeds. Place cut side down in a baking dish and bake at 350°F for about 40 minutes or until soft. With a metal spoon, scrape out the cooked pumpkin, leaving a 1/8 to 1/4 inch thick shell.
Increase the oven heat to 400°F.
Process the apples in a food processor until chunky. Add the pineapple, walnuts, cinnamon, nutmeg, cloves and process until just mixed. Spoon into the pumpkin shell.
Cover with the top. Bake in 400°F oven for 40 minutes or until the filling is hot.