How to Make It
Preheat oven to 350°F. Spray 13x9-inch glass baking dish with cooking spray. Combine ricotta cheese, 2 tablespoons water, parsley and 1/4 teaspoon black pepper in small bowl; set aside.
Heat large skillet over medium-high heat. Add beef and onion; sprinkle with Italian seasoning, salt and remaining 1/4 teaspoon black pepper. Cook 7 minutes or until beef is crumbled and no longer pink, stirring occasionally. Add garlic; cook 1 minute more or until fragrant. Drain. Add undrained tomatoes, tomato sauce, remaining water, vinegar and red pepper flakes to skillet. Reduce heat and simmer 10 minutes, stirring occasionally.
Assemble lasagna by spreading about 1 cup meat sauce over bottom of dish. Place 3 dry noodles over sauce, top with 2 cups meat sauce, half of ricotta mixture, 1 cup mozzarella cheese and 1/3 cup Parmesan cheese. Repeat layers, ending with a layer of noodles topped with remaining sauce and remaining mozzarella and Parmesan cheeses.
Spray underside of aluminum foil with cooking spray; cover dish tightly with foil. Bake 45 minutes. Remove foil and bake 15 minutes more or until cheese melts and sauce is bubbly. Let stand 15 minutes before serving.