Ricotta is a common filling for ravioli in Italy, usually mixed with other ingredients like spinach, Swiss chard or leftover meats. This recipe uses sausage. If you don’t want to make pasta dough, purchase fresh lasagna sheets and use them to create the ravioli.
In food processor, pulse onion, celery and carrot until finely chopped. In large skillet, add olive oil over medium heat. Add vegetables, and cook until slightly softened, about 4 minutes. In bowl, crumble sausage into small pieces. Add wine, and work in with your fingers. Add sausage to skillet, and cook, breaking up with spatula, until sausage is cooked through and in very small pieces, 4–5 minutes. Transfer sausage and vegetables into clean bowl. Let cool, then stir in ricotta, Grana Padano and parsley.
Cut pasta dough into four equal pieces, and flatten into squares. Roll through widest setting on pasta machine, fold in thirds, then roll again. Fold and roll once more to smooth and straighten dough. Repeat with remaining 3 pieces of dough. Roll each strip through progressively tighter settings of machine, stopping at next-to-last setting. Ideally, strips should be 6 inches wide. Lay strip on floured surface. Place heaping teaspoons of filling at 4-inch intervals down lower half of strip. There should be 6–7 mounds per strip. Brush around filling with water, then fold top edge of pasta over and press to seal, being sure to leave a little airspace. Use pastry-cutting wheel to make even squares between mounds of filling. Repeat with remaining dough and filling. Store ravioli on baking sheets lined with floured kitchen towels until ready to cook.
Bring large pot of salted water to boil. In skillet, bring marinara sauce to simmer. Drop ravioli into water, and stir gently to separate. Simmer until al dente, about 2 minutes after water returns to boil. Carefully transfer ravioli to marinara sauce. Add basil, and toss gently to coat pasta. Add pasta water if it seems dry. Sprinkle with grated cheese, toss gently and serve. Serves 6.