This recipe is from Moosewood. I never add the winter squash because I don't have any on hand and don't go through the trouble to make it... although they do suggest using a jar of baby food. I also substitute a tablespoon or two of curry powder with the 1 tsp turmeric. I also add some feta cheese if I have some in my fridge. It adds a nice flavor to the stew. Everybody always asks about it at work and wants the recipe. This stew tastes better the next day and freezes well.