In a medium saucepan, bring water to a boil. Add the pumpkin cubes and cook until tender, about 10-15 minutes. Drain and mash the pumpkin until smooth.
In a separate saucepan, bring 2 cups of water to a boil. Add the salt and stir in the maize meal gradually, mixing continuously to prevent lumps.
Reduce the heat to low and cook the maize meal mixture, stirring frequently, for about 10 minutes until thickened.
Fold the mashed pumpkin into the maize meal mixture. Continue cooking for an additional 5 minutes, stirring well.
Stir in the vegetable oil or butter. Add black pepper and nutmeg if using. Mix until well combined and smooth.
Spoon the Mokhatsa onto plates or bowls. Serve hot as a side dish or a hearty main course.
Enjoy your meal!