FOR THE FILLING: Bring 3 quarts of water to a boil in a large pot. Set up an ice bath nearby.
1 pound Fresh broccoli rabe (trimmed)
1 tablespoon salt
When the water is boiling, add 1 tablespoon salt. Then add the broccoli rabe and cook until very tender, about 6 minutes. Using a spider or a slotted spoon, transfer the rabe to the ice bath.
1 pound Waxy golden potatoes (such as Yukon Gold- peeled and cut into 1/2-inch dice)
Add the potatoes to the boiling water and cook until tender, 8 to 10 minutes. Drain, and pass through a ricer or mash with a potato masher.
Once the rabe is cooled, drain and pat it to dry. Chop the rabe until it is almost a paste (you can do this in the food processor).
1 1/2 cups Fresh ricotta (drained)
1/2 cup Freshly grated Parmigiano-Reggiano
1/4 cup Extra virgin olive oi
Salt and pepper
In a medium bowl, combine the rabe, potatoes, ricotta, Parmigiano, olive oil, and salt and pepper to taste. Stir well to combine.
Basic Pasta dough
1 cup Semolina flour (for dusting)
Roll out the pasta dough to the thinnest setting on a pasta machine, using a good dusting of the semolina between the resting sheets to maintain a good separation. Cut the pasta sheets into 4-inch squares. Place a scant tablespoon of the ricotta filling on a one half of each square, and then fold it over like a book to enclose the filling, forming a rectangle. Press the edges of the ravioli with your fingers to seal them. (The ravioli can now be frozen between sheets of parchment, sprinkled with semolina, until ready to cook.)
12 tablespoon Unsalted butter (1 1/2 sticks)
15 Fresh Sage Leaves
Bring 8 quarts of water to a boil. While the water is heating, heat the butter in a 14-inch sauté pan over high heat until the foam subsides and it begins to turn a light brown color. Add the sage and remove the pan from the heat.
2 tablespoon salt
Freshly grated Parmigiano-Reggiano
Add 2 tablespoons salt to the boiling water. Then add the ravioli, and cook until they are tender and cooked through (you should taste one to test it), about 3 minutes (a little more if frozen). Reserving 3 tablespoons of the cooking water, drain the ravioli. Add them to the pan containing the butter and sage. Add the reserved cooking water, and toss gently over high heat for 1 minute. Pour the hot ravioli onto a warmed platter, and serve immediately with Parmigiano grated over the top.
3 1/2 cups All-purpose flour (plus 1/4 for dusting)
5 Extra-large eggs
FOR THE BASIC PASTA DOUGH: Mound the flour in the center of a large board. Make a well in the middle of the flour, and add the eggs to it. Using a fork, beat the eggs. Then gradually incorporate the flour, starting with the inner rim of the well. The dough will come together when half of the flour is incorporated. Keep working the dough until all the flour is incorporated.
Start kneading the dough with both hands. Once you have a cohesive mass, remove the dough from the board, and scrape up and discard any leftover bits. Lightly flour the board and continue kneading for 6 more minutes. (You can do the whole dough process in a food processor, with a little less of the romance but a very similar result: Place the flour and the eggs in the bowl of the processor and pulse 15 times for 6 seconds at a time.) the dough should be elastic and a little sticky. Wrap it in plastic wrap and allow it to rest at room temperature for 50 minutes. Do not skip the kneading or resting portion of this recipe. (The wrapped dough can be stored in the fridge for up to 1 day.)