The main ingredient in traditional pumpkin pie is pumpkin puree, which is made from roasted or cooked pumpkin. This pureed pumpkin forms the base of the filling, giving the pie its distinct flavor and texture. To prepare the pie, the pumpkin puree is typically combined with other ingredients, such as sugar, eggs, milk or cream, and spices like cinnamon, nutmeg, and ginger. The mixture is then poured into a pie crust and baked until set. Pumpkin pie is a staple dessert in American cuisine, especially during the fall and Thanksgiving seasons.