Cook rice.
Cook ground beef, onion and garlic in skillet until meat is browned. Drain off excess liquid. Add seasonings and tomato soup; simmer, covered, 10 minutes. Stir in rice.
In the meantime cut the tops off the green pepper. Remove membranes and seeds. Cook pepper and tops in boiling salted water for about 3 minutes. Drain peppers.
Place pepper in a large casserole dish. Stuff peppers and replace tops. Add about 2-3 cups boiling water to bottom of casserole dish. Cover. Bake in a hot oven (400 °F.) 30 - 35 minutes.