Hubbard squash is sweeter and heartier than pumpkin, and one year, we got a Hubbard to grow to 27 pounds! We made many of these pies that year. You can easily substitute Butternut Squash with great results--this pie will turn out more delicately flavored. Serve either one cold from the refrigerator or slightly warm. Whipped cream, with a dash of nutmeg, makes it extra special.