Making homemade ravioli can be easier and quicker than you think. Instead of making a homemade pasta dough for their specialty ravioli, many professional chefs use won ton skins. These economical dough squares can be found in every supermarket, and fillings will whip up in no time from a few simple ingredients. Have the sauce ready and the table set for dinner, because these little squares cook in a few minutes. You should be ready to cook, drain and sauce the ravioli quickly. If you do need to hold them for a few minutes, hold on a warm dinner plate with a few drops of warm water and a drop of oil. Cover with a pie tin or saucepan cover and set in a warm place.
Open the wonton package by cutting a lid on the top. This will help keep the wonton skins from drying out. Spread out as many squares as you like on a clean surface. A cutting board is ideal because you can pick it up and carry it to the boiling water.
Gently heat the olive oil in a medium skillet. Add the onion and cook, stirring, until it is soft but not brown. Add the spinach and garlic. Stir until the spinach is just wilted and remove from the heat. Stir in salt, nutmeg and a pinch of black pepper. Place in a strainer and let drain for several minutes.
Mix spinach with ricotta and Parmesan cheeses, taste again for seasoning. Cool thoroughly in the refrigerator before using.
Put a rounded teaspoon of filling in the middle of each square. Lightly moisten the four edges of the square with a little water (use your finger or a damp pastry brush). Press another square on top and firmly seal the edges together.
Drop the ravioli into the boiling water. Cook in batches if you are making a lot. They will sink to the bottom, then rise to the top. After they rise, cook simmering two or three minutes. Carefully lift the raviolis gently out of the water with a skimmer or strainer.