Remove the roots and stems from spinach and save for later use. Rinse spinach in cold water as many times as necessary to rid it of any sand. Place in a pot with no water other than the water the spinach retains from washing. Add a pinch of salt and cook, covered for about 5 minutes.
Transfer to a colander and set aside to drain.

Place oil, onion, carrot and chicken breast in a large skillet. Add 1 tsp. salt and 1/8 tsp. pepper and cook over moderate heat for 4 to 5 minutes longer or until most of the liquid has evaporated. Add flour and stir 1 more minute. Remove from heat; cool for 5 or 6 minutes, then chop very fine. 

Roll the dough paper thin and place over a floured board. With a feather brush dipped in cold water lightly brush the top to maintain moisture. Place mounds of spinach mixture on the dough in straight lines about 2 inches apart (measurements are from the centers of the mounds), making 8 or 9 dozen of them.

Roll out the other half of the dough paper thin and place loosely over the sheet with the mounds. 
With an Italian pastry wheel, press along the furrows, cutting and sealing at the same time.

Bring 6 quarts of water to a boil. Add ravioli and 3 Tbsp. salt. Stir until boiling resumes.
Cook 4 to 5 minutes, uncovered. Drain and serve with marinara or meat sauce.
Serves: 6-8