Unwrap dough and cut into quarters (or eighths, if you prefer to work with a smaller amount of dough).
Take one piece of dough and run it through a pasta roller set to 0.
Turn it horizontally.
Fold the left side in toward the middle, making sure to line up the edges of the pasta.
Repeat with right side.
Run it back through the pasta roller set to 0.
Repeat this process 3 or 4 times to straighten edges of dough.
Change setting to 1.
Run dough through twice.
Change dough setting to 2.
Run dough through once.
Repeat for each setting through 7.
Lay dough out and trim ends, if necessary.
Cut in half.
Spoon or pipe 1 Tablespoon filling every 1½ inches down 1 piece of dough.
Use a pastry brush to brush egg wash on edges of dough and between mounds of filling.
Place second piece of dough over top of filling.
Gently press around filling to remove air.
Press edges to seal.
Use a pasta wheel to crimp and cut edges and between each mound of filling.
Repeat until all pasta and filling have been used.
Make sauce.
While butter is melting, bring a large pot of water to a boil.
Salt generously.
Add pasta.
Cook for 3 minutes.
Drain.
Toss gently in sauce to coat, or drizzle sauce over the top of pasta.