In a large pot, bring the water to a boil. Add the salt and sugar (if using).
Gradually stir in the maize meal, whisking continuously to prevent lumps.
If using grated pumpkin or butternut squash, stir it into the mixture.
Reduce the heat to low and cook the mixture, stirring frequently, for about 15-20 minutes, or until it thickens and the maize meal is fully cooked.
Transfer the Sidvudvu to a serving dish. Let it cool slightly before slicing or serving.
Enjoy your meal!