If you do not have a food processor, the pumpkin may be put through a food mill or forced through a fine sieve with the back of a wooden spoon. Alternatively, you can cook the pumpkin, sugar, and spices together before pureeing, then whir the mixture in a blender, adding enough of the cream called for in the recipe to permit the pumpkin to flow easily over the blades. In either case, heat the pumpkin with the (remaining) cream and milk, as indicated, then slowly whisk the mixture into the beaten eggs. The pie may be served slightly warm, chilled, or at room temperature.