Heat oven to 375?F. In large nonstick skillet, brown ground beef over medium heat 8 to 10 minutes or until no longer pink. Pour off drippings. Season beef with salt; stir in spaghetti sauce, tomatoes and red pepper; set aside.
Meanwhile in medium bowl, combine Ricotta cheese, Parmesan cheese and egg.
Spread 2 cups beef sauce over bottom of 13 ? 9-inch baking dish. Arrange 4 lasagna noodles lengthwise in single layer. Place 5th noodle across end of baking dish, breaking noodle to fit dish; press noodles into sauce. Spread entire Ricotta cheese mixture over noodles; sprinkle with 1 cup Mozzarella cheese and top with 1 1/2 cups beef sauce. Arrange remaining noodles in single layer; press lightly into sauce. Top with remaining beef sauce.
Bake 45 minutes or until noodles are tender. Sprinkle remaining Mozzarella cheese on top; tent lightly with aluminum foil. Let stand 15 minutes; cut into 12 (3 ? 3-inch) squares.
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