Peel and cut the squash into not too small cubes and bring to a boil. Be careful with the stitch so it doesn't fall apart.
Add the chopped onion in the refractory where you will make the salad, and place the cooked and still hot pumpkin on top of the onion. Wait a few minutes.
Add salt, black pepper and parsley.
Mix everything carefully and put it in the fridge.