It's best to use the large carving and decorative pumpkin for just that, carving and decorating. They're not meant to be roasted or steamed to get the puree. Although I do have friends that have used carving pumpkins to bake and cook with. You would get better results for this bread using a sugar pumpkin, butternut squash or kabocha pumpkin for puree. I used canned pumpkin for this bread and that's what I usually do.