Preheat oven to 350 degrees. Layer a large ovenproof baking dish with about 1/4 of the tomato sauce. In a medium bowl mix the ricotta with the egg, salt, and pepper. Spread the ricotta on the Crepe in a straight line, fold edges of crepes over. Place in pan, flap side up. Put a thin slice of mozzarella on each manicotti. Pour tomato sauce over all. Bake at 375 degrees for 30 minutes. Serve.
In a medium bowl whisk eggs and water until smooth. Add flour, 1/4 cup at a time, and stir until smooth. Heat 6-inch skillet on medium heat. Grease skillet lightly. Ladle about 3 tablespoons of batter in skillet and spread it around. Cook until firm, but not brown. Flip crepes out and cool on a paper towel.
Recipe courtesy Sue Paterno, wife of Penn State Football coach Joe Paterno