For the Filling:
1 tablespoon olive oil
1 (10 ounce) bag fresh spinach
1 cup feta cheese
½ cup pine nuts
To Make the Ravioli:
2 fresh pasta sheets
1 egg
1 tablespoon water
Heat the olive oil in a large skillet over medium-high heat. Cook the spinach until fully wilted, about 2 minutes. Let cool, then squeeze the spinach to remove as much liquid as you can.
Combine the cooked spinach, feta, and pine nuts in a blender or food processor and pulse until it is the consistency of a fine paste. Beat the egg and water together in a small bowl.
To assemble the ravioli, brush the egg over a sheet of pasta. Drop the filling mixture on the dough by teaspoonfuls about one inch apart. Cover the filling with the top sheet of pasta, pressing out the air from around each portion of filling. Press firmly around the filling in whatever shape you wish (circles, squares) and then cut them apart. Press the tines of a fork around the edges of the pasta to seal each raviolo.
Fill a large pot with lightly salted water and bring to a rolling boil over high heat. Once the water is boiling, add the ravioli, stir gently, and return to a boil. Cook uncovered until the ravioli float to the top and the filling is hot, about 3 to 5 minutes.
