In a large skillet over medium heat, cook the ground beef and diced onion together until the beef is browned and the onion is softened. Drain and discard excess grease.
Stir in the minced garlic and cook for 30 seconds until fragrant.
Transfer the beef mixture to the slow cooker.
Add the chopped cabbage, carrots, beef broth, diced tomatoes, tomato sauce, brown sugar, Worcestershire sauce, paprika, thyme, oregano, bay leaf, salt, and black pepper. Stir well to combine.
Cover and cook on LOW for 6 hours or HIGH for 3 hours, until the cabbage is tender.
Stir in the uncooked white rice. Cover and cook on HIGH for 1 additional hour, or until the rice is tender.
Remove and discard the bay leaf. Taste and adjust seasoning if needed before serving.
Video
Notes
This dish thickens as it cools and reheats well.
Italian sausage adds extra flavor if you prefer a richer version.
Freeze leftovers in individual portions for easy meals later.