Bring 6 quarts of water to boil and add 2 tablespoons of salt.
In a mixing bowl, stir together ricotta, parsley, Parmigiano, nutmeg and eggs until well blended. Roll out pasta to thinnest setting and cut into 6-inch squares. Place 2 tablespoons ricotta mixture in the center of each square. Fold opposite corners of each square together and press firmly to seal and form a triangle. Bring opposite points of the triangle together to form a ring and press firmly to meld the ends together. Continue until all pasta is done. Drop tortelloni into boiling water and cook until tender, about 8 to 9 minutes.
Meanwhile, melt butter and sage together in a 12 to 14-inch saute pan over medium heat, being careful not to brown. Drain cooked tortelloni and gently pour into pan with butter and remaining cheese and toss gently over medium heat. Place in warm serving bowl and serve immediately.
Make a mound of the flour in the center of a large wooden cutting board. Make a well in the middle of the flour and add the eggs, oil and any other flavoring you choose. Using a fork, beat together the eggs, oil and flavorings and begin to incorporate the flour starting with the inner rim of the well. As you expand the well, keep pushing the flour up to retain the well shape. Do not worry that this initial phase looks messy. The dough will come together when 1/2 of the flour is incorporated. Start kneading the dough with both hands, using the palms of your hands primarily. Once you have a cohesive mass, remove the dough from the board and scrape up any left over crusty bits. Lightly flour the board and continue kneading for 3 more minutes. The dough should be elastic and a little sticky. Continue to knead for another 3 minutes, remembering to dust your board when necessary. Wrap the dough in plastic and allow to rest for 30 minutes at room temperature. Note: do not skip the kneading or resting portion of this recipe, they are essential for a light pasta.
Yield: 1 pound