This may be done the day before making gnocchi. Place a colander in a bowl or plate with cheesecloth or paper towels. Place the ricotta in the cheesecloth and twist the ends to fully surround it.
1
Cover a large, rimmed baking sheet with a clean kitchen towel and flour thoroughly. Mix 1 packed cup of drained ricotta, Parmigiano, eggs, salt, pepper, and nutmeg in a large bowl. Mix thoroughly.
2
Cut the dough into 4 equal pieces. A clean kitchen towel should cover the remainder after removing one piece. Sprinkle extra flour on the work area and shape the dough into a finger-thick rope. Roll leftover dough into ropes.
3
Make a tiny indentation in each piece of dough by rolling it on a floured fork or gnocchi board with your thumb. The groove from your finger and ridges from the fork tines or gnocchi board should be visible when finished.
4
Let gnocchi sit uncovered for 30 minutes. Cover with a clean kitchen towel and cook for 2 hours. (See comments for freezing advice.) Prepare spaghetti sauce now!Salt a big saucepan of boiling water liberally. Prepare warm sauce.
5
Put the gnocchi in the boiling water gradually. If required, cook in batches to minimize pot overload. Gnocchi will bob to the top in a few minutes before the water boils.
6
Serve heated spaghetti sauce in bowls. Skim or slotted spoon the cooked gnocchi into the serving dish and add extra sauce. Toss gnocchi lightly to coat. Garnish with Parmigiano and serve.
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