1.5kg/3lb 5oz butternut squash, peeled, seeds removed, cut into 2cm/1in pieces
large pinch chilli flakes
10 fresh sage leaves, chopped
salt and freshly ground black pepper
60²µ/2½´Ç³ú butter
6 tbsp crème fraîche
40²µ/1½´Ç³ú Parmesan (or a similar vegetarian hard cheese), coarsley grated