Firstly we need to boil some water enough to fit the pumpkin. boil the pumpkin for about 10 to 12 minutes, so we can get the pumpkin soft enough to mash up. When the pumpkin is done, put it in a mixing bowl and start mashing it up.
Now that the pumpkin is nice and soft we can add our other ingredients. Add your onions, mayonnaise and sliced ham. Mix everything well, until you got the mayonnaise mixed in.
Now your done and ready to serve. I like to put in the refrigerator 30 minutes to hour before serving.
Recipe by Cooking Japanese Style at https://www.cookingjapanesestyle.com/2014/12/17/japanese-pumpkin-salad/