Brown sausage, onions, half the parsley and minced garlic in a skillet or stock pot. Drain. Add tomato paste, tomato sauce, water, and seasonings. Mix well and simmer, covered, for five minutes. Stir occasionally.
In a bowl combine the remaining parsley, ricotta, spinach, parmesan, eggs, garlic salt, and pepper. Mix well.
In a lightly greased 13x9x2 baking dish spread 2 cups of the sauce mixture. Begin layering with four noodles (though my pan would only hold three), 1/3 of the cheese mixture, 1/3 of the remaining sauce, and 1 cup of Mozzarella. Repeat layering, ending with the noodles, sauce, and cheese.
Bake, covered at 350 degrees F for 45 minutes. Remove cover and bake for an additional 10 minutes. Let lasagna stand about 10 minutes before serving.