In a large Dutch oven or stockpot, brown the ground beef over medium-high heat until no longer pink. Drain the excess fat.
Add the diced onion and chopped bell peppers to the pot. Sauté for 5 to 7 minutes until the onions are translucent and peppers begin to soften.
Stir in the minced garlic and cook for 60 seconds until fragrant.
Add the tomato sauce, diced tomatoes, beef broth, brown sugar, Worcestershire sauce, salt, and black pepper. Stir to combine.
Bring the mixture to a boil, then reduce the heat to low.
Stir in the uncooked white rice. Cover the pot and simmer for 30 to 35 minutes, or until the rice is tender and the peppers are soft.
Adjust seasoning to taste and serve warm.