Do not overcook the risotto nor let it catch.
Use special risotto rice like Arborio for this dish.
Optionally, deep fry some fresh sage leaves in some very hot oil until crisp, drain on kitchen paper and use a garnish.
It is possible to eat the skin of the squash if desired. Alternatively, scoop out most of the flesh to only leave a thin border behind, in which case the skin can be discarded after the meal.