Preheat the oven to 350. Wash and dry the pumpkin. Select a large, very sharp knife. Set the pumpkin on a cutting board. Knock off the stem. Cut the pumpkin in half. When the pumpkin is completely cut through, separate the halves and lay them on their backs. Using a spoon scoop out the pulp and seeds. (To roast the seeds see my earlier post, “Sign of the Season.”)
Select one or two pans large enough to hold the pumpkin halves. Place the pumpkins halves in the pan(s) cut side down. Fill the pans about half way with water. Add 1 tsp. of kosher salt to each pan. Lift the pumpkins halves slightly—this allows the water to flow underneath the halves. Place the pans in the preheated oven.
Bake the pumpkin halves until the flesh is completely cooked, about 45 minutes. The skin will not be soft, but should give when touched, indicating that the flesh underneath is thoroughly cooked. Remove the pan(s) from the oven. When the halves have cooled sufficiently to handle, use two large long handled spatulas and remove them to a cutting board. Flip the halves onto their backs and let them rest while you prepare the colander. (The water can be saved and used in soup.)
Line a large colander with a paper towel, then with a triple layer of cheese cloth large enough to hang over the sides of the colander—about 6 inches all the way around. Set the colander over a bowl. Using a large metal kitchen spoon, scoop the flesh out of the pumpkin and into the colander. As the pulp cools, it will shed water into the bowl. Allow the pulp to drain for two hours.
When the pulp is cold and has drained for two hours, gather up the overhanging cheesecloth in one hand. Twist the gathered material and start squeezing. The goal is to squeeze as much moisture as possible from the pulp. Don’t be alarmed by the amount of juice that streams from the pulp. Squeeze the pulp until the volume is reduced by half. The pulp should be shiny and thick. When this has been accomplished, the pulp is ready to be pureed. The pumpkin juice has a lovely sweet flavor and can be reserved for use in soup.
The pulp is now ready to be pureed. Place the pulp in the bowl of a food processor. Pulse the pulp until is smooth and thick—about 10 pulses. The pulp can be used immediately, frozen for future use, or stored in an air tight container for use in a day or two.