In 1-quart saucepan, heat water, pumpkin and 3 tablespoons of the butter over medium heat to 120°F to 130°F, stirring occasionally. Add pumpkin mixture and egg to flour mixture. Beat with electric mixer on medium speed 3 minutes, scraping bowl occasionally. By hand, stir in just enough of the remaining 2 1/2 to 3 cups flour to make a soft dough that leaves sides of bowl. Place dough on floured surface. Knead 3 to 5 minutes or until dough is smooth and springy.