Pile the flour in the middle of a board or clean countertop. Make a well in the center, and add in the pumpkin puree.

Using clean hands, mix together the puree and flour until it forms a stiff dough (adding more flour if needed to make it not sticky).

Divide the dough in half, covering one half with a towel to keep it from drying out. Form remaining dough half into a disc.

Flour a rolling pin and roll out the disc into a very thin sheet (you should almost be able to see through it in parts). Using a sharp knife or pizza cutter, cut into ¼" wide strips. Repeat with remaining dough disc.

To cook pasta: bring to a boil two quarts of salted water. Drop noodles into the water a few at a time. Cook for two minutes, or until all the noodles float. Drain and top with sauce.