Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
                        ***PASTA***
   3      cups          flour -- all purpose
   3      large         eggs -- lightly beaten
                        ***- FILLING***
   1      medium        squash -- acorn (about
                        -- 1 3/4 pounds)
   1      cup           escarole -- leaves
   1 1/2  tablespoons   butter
     1/3  cup           cheese -- parmesan, grated
   1      tablespoon    parsley -- chopped
                        ***TOMATO-CREAM***
     1/4  cup           butter -- unsalted
   1      cup           cream -- whipping
     1/3  cup           cheese -- pecorino
   1 1/2  teaspoons     oil -- olive
   2      tablespoons   water -- (about)
     1/4  cup           ham -- chopped
     1/4  cup           cheese -- ricotta
   1      large         egg
                        pepper -- black, ground
   1      pinch         nutmeg -- grated
                        salt -- (to taste)
                        ***SAUCE***
     1/4  cup           sauce -- tomato
                        cheese -- parmesan, grated

Preparation:

For Pasta: In a mixer with a dough hook, or a processor, combine the flour, eggs and oil, adding water as needed to form a soft ball. Transfer to a lightly floured work surface and knead for about 5 minutes. Cover with a damp cloth and set aside for 30 minutes. For Filling: Halve the squash and remove all of its seeds and strings. Cut the squash up into large wedges and cook, covered, in boiling salted water until tender, about 12 minutes. Drain completely and cool briefly. Scoop out the flesh. (You should have about 2 cups.) Place the escarole in a saucepan with about 1 cup of water; cover. Steam the escarole, tossing once or twice, just until wilted, 3 to 5 minutes. Drain in a colander, rinse with cold water, squeeze dry and chop coarsely. Set aside. Melt 1 1/2 tablespoons of butter in a large skillet over medium-high heat. Add squash and cook, stirring, until dry, about 5 minutes, breaking up the flesh coarsely as it cooks. Add Parmesan cheese and parsley, lower heat to medium and stir for 3 minutes. Transfer the mixture to a mixing bowl and stir in the escarole, ham, ricotta and egg. Season with black pepper, nutmeg and a little salt, if desired. Set aside. To Assemble: Cut the dough into 3 pieces. Roll each piece with a heavy rolling pin on a lightly floured board (or use a pasta machine) until it's 1/8-inch thick. (You should be able to see your fingers through the dough.) Use a 4-inch cutter to cut out rounds of dough; place them on a lightly floured baking sheet. Place about 1 1/2 teaspoons squash filling on lower half of each round, leaving a border. Fold top half of each round over filling and press edges together to seal. Warp edges of each half-circle around your index finger, bringing ends together to overlap by about 1/4 inch. Pinch edges to seal. For Sauce: Melt 1/4 cup of butter in a heavy saucepan. Add cream and a generous amount of white pepper, whisking over medium-high heat. Stir in the pecorino cheese (in a pinch, you could probably get away with Parmesan, but it won't taste the same) and tomato sauce. Boil gently 3 to 4 minutes. Meanwhile, cook tortelloni in a large pot of boiling salted water until they float to the surface, then boil 1 minute longer; drain. Place the tortelloni in heated serving bowls, nap with sauce and serve immediately, with additional Parmesan and white pepper. Source: New York's Master Chefs, Bon Appetit Magazine, Written by Richard Sax, Photographs by Nancy McFarl