You can use the fresh or canned variety to make pumpkin soup. If you use canned, make sure you don't buy pumpkin pie filling by mistake! If you decide to go with fresh, you'll want to roast the pumpkin first and then dice the cooked, peeled flesh. From there, it's up to you. You can flavor your soup with things like maple syrup, garlic, ginger, curry, onions or apple. After everything is puréed, add a bit of half-and-half for some additional richness or top with a dollop of sour cream.