Wash the chestnut pumpkin thoroughly, peel it, and cut it into suitable sizes.
Steam the chestnut pumpkin for about 15 minutes and let it cool.
Slice the cucumber and red onion thinly.
Combine the steamed chestnut pumpkin and sliced vegetables in a bowl.
Make the salad dressing by mixing plain yogurt, salt, and pepper.
Add the dressing to the ingredients and mix well.
Serve in a dish and top with nuts.