Preheat oven to 350 degrees. Spray 8-by-8 inch dish with butter-flavored cooking spray. In a large bowl, combine meat, 1/3 cup tomato sauce, rice, onion, and Tobasco sauce. Mix well with hands to combine. Pat meat mixture into prepared baking dish. Bake 30 minutes. In a medium bowl, combine remaining 2/3 cup tomato sauce, undrained stewed tomatoes, mustard, Equal, and Cajun seasoning. Mix well to combine. Spoon tomato mixture evenly over meat loaf. Bake an additional 15 to 20 minutes. Place baking dish on wire rack and let set 10 minutes. Cut into 6 servings.