Whisk together first 5 ingredients. Stir in green pepper, celery, onion and basil. Cut tomatoes into wedges; cut wedges in half. Stir into pepper mixture., In a shallow bowl, whisk together egg and lemon juice. In another shallow bowl, toss bread crumbs with cheese, walnuts and lemon pepper., Cut tenderloins crosswise into 1-in. slices; flatten slices with a meat mallet to 1/2-in. thickness. Sprinkle with salt and pepper. Dip in egg mixture, then in crumb mixture, patting to adhere., In a large skillet, heat 1 tablespoon oil over medium-high heat. Add a third of the turkey; cook until golden brown, 2-3 minutes per side. Repeat twice with remaining oil and turkey. Serve with tomato mixture; sprinkle with basil.