Cut squash in large pieces; place in large baking pan. Cover with foil and bake in moderate oven (350°) about 1¼ hours, or until squash is tender.
Scoop out pulp and put through a sieve. Stir in syrup, butter, salt and pepper. If mixture is thin, simmer gently to reduce moisture. Otherwise, heat just to boiling; turn into serving dish and garnish with chopped chi