Wash the outside of the parmigiano crusts carefully.
Boil the crusts in 2 cups broth (or hot water), 10 minutes should be enough.
In a food processor, blend the crusts while still hot. Add the egg white, breadcrumbs, salt, flour, and herbs. You may need more or less of these ingredients depending on the amount of your blended crust, the important thing is to make a dough with which you can shape the balls.
Shape the balls and boil them in remaining broth or hot water (7-10 minutes).
Remove balls from liquid and add to a pan with tomato sauce. Cook for another 5 minutes or so.
Serve warm with a drizzle of olive oil, basil, and bread on the side!
