Peel, dice and cook squash in water or steam until smooth and mash effortlessly with fork
Remove squash from water, place in bowl and mash it
In the same pan that cooked the squash, throw the water away, put the butter and fry the leeks and thyme
Return the pumpkin to the pan over low heat, add the other spices, mix everything and try until you like it
Remove from heat and serve with parmesan cheese on top