Wash the sweet pumpkin thoroughly, remove the seeds, and peel it.
Cut the sweet pumpkin into small pieces, place them in a steamer, and cook until tender.
Mash the cooked sweet pumpkin until smooth.
In a pan, add the pumpkin, milk, heavy cream, and sugar. Simmer over low heat, stirring continuously.
Stir for about 20-30 minutes until the mixture thickens.
Turn off the heat, let it cool, and transfer to a jar.