Wash the sweet pumpkin thoroughly, remove the seeds, and cut it into bite-sized pieces.
Place the sweet pumpkin pieces in a steamer and steam for 15 minutes.
Let the steamed sweet pumpkin cool, then remove the skin and mash it.
Finely chop cucumber and apple.
In a bowl, mix the mashed sweet pumpkin, cucumber, apple, Greek yogurt, and salt evenly.
Transfer to a plate and serve.