To make your own pumpkin puree, use 1 large or 2 medium Sugar Pie or other eating (not field) pumpkins. Cut out the stem and quarter the pumpkin lengthwise. In a preheated 400deg.F oven, bake the quarters, cut side down, in a shallow roasting pan with a little water in the bottom until tender, about 1 hour. Let cool, scrape out the seeds, cut the flesh from the peels, and force it through a medium-mesh sieve or the medium disk of a food mill. Freeze any leftover puree for up to 2 months.