In a skillet over medium heat, brown pork until no longer pink. Add onion and garlic. Cook until vegetables are tender; drain. Stir in rice, gravy, salt and thyme. Spoon into a greased 11x7-in. baking dish. , In the same skillet, saute carrot and onion in butter over medium heat for 5 minutes. Stir in cabbage; cook for 1 minute. Add broth, salt and pepper; cover and cook for 10 minutes. Spoon over pork layer. , Spoon or pipe mashed potatoes on top; sprinkle with cheese. Bake, uncovered, at 350° for 45 minutes or until browned.