Wash the sweet pumpkin thoroughly, peel it, and cut it into bite-sized pieces.
Boil the sweet pumpkin until fully cooked and mash it.
Season with salt and pepper, then mix in a little mayonnaise.
Spread the sweet pumpkin mousse on whole wheat bread and top with a slice of cheese.
Cover with another slice of bread, melt butter in a pan, and grill the sandwich until golden brown.
Cut the sandwich into easy-to-eat pieces.