Unlike many stuffed winter squash recipes, this one is more savory than sweet thanks to the spicy sausage and fresh sage. The combination of sausage, meaty Portobello mushrooms, sweet apples and crunchy walnuts rounds out the flavor of this satisfying main course. Variations: For less heat, use ½ pound spicy and ½ pound mild Italian sausage. If you prefer a sweeter dish, simply add more brown sugar prior to baking.