I recently brewed Smashing Pumpkin Ale from NB. I baked two 15oz cans of pure pumpkin in the oven at 350 for 35 mins. I then put this in a grain bag, along with 3lbs of 6row, and the specialty grains that came with the kit. I found that, for the most part, the pumpkin dissolved into the water. I say "for the most part" because after an hour of soaking everything, my 3.5gal wort was down closer to 1gal. The pumpkin stuck to the edges of the grain bag and kept most of the water in! It took me a good 30 more mins to strain that out into another pot and put it back into my kettle for the boil. Of the 15 or so brews I've done, this ended up being my toughest yet. I brewed a week ago today so I can't say how it turned out yet though....