Wash the sweet pumpkin thoroughly, remove the skin and seeds, and slice it thinly
Steam the sweet pumpkin until soft and fully cooked
Mash the cooked pumpkin with salt, pepper, and mayonnaise
Generously spread the pumpkin mousse on one slice of bread
Add sliced cheese and vegetables (lettuce, cucumber, etc.)
Top with another slice of bread to complete the sandwich
Cut it into bite-sized pieces