Dice onion, garlic, and bell peppers. In a large pot or dutch oven, brown ground meat on high heat and season with salt. Drain fat if any, reduce heat to medium-low, then add peppers, onions and garlic. Cook about 5 minutes on low heat.
Add tomatoes, tomato sauce, chicken broth, marjoram and season with salt and pepper to taste. Cover and simmer on low heat for 30 minutes. Serve about 1 1/3 cups of soup in each bowl and top with 1/2 cup cooked brown rice. Optional: Serve in the hollow inside of a bell pepper.