Remove seeds and any inedible pulp from melon (do not peel). Section and place on a dinner plate.
Combine pear, nectarine, berries, and banana in a bowl. Set aside.
In a microwave-safe dish, mix marmalade and Kahlúa; microwave on HIGH for 30 seconds. Add nutmeg; stir well.
Pour most of sauce over fruit; stir well. Fill center of each melon section with fruit mixture. Drizzle remaining sauce over.
Servings: 4 to 6