1. Brown the beef (important for flavor)
In a skillet over medium heat, cook the ground beef and diced onion until the beef is no longer pink and the onion is soft, about 6–8 minutes.
Drain excess grease.
2. Add garlic
Stir in the garlic and cook 30–60 seconds until fragrant.
3. Dump into the slow cooker
Add cabbage and carrot to the bottom of a 5–6 quart slow cooker.
Spoon the beef mixture over the top.
4. Add everything else
Pour in diced tomatoes, tomato sauce, beef broth, rice, Worcestershire sauce, thyme, oregano, paprika, salt, pepper, brown sugar (if using), and bay leaf.
Stir gently to combine.
5. Slow cook
LOW: 6–8 hours
HIGH: 3–4 hours