Heat olive oil in a large saute pan.
Add onion and garlic. Cook for 3 to 5 minutes, until onions are tender.
Add ground beef. Cook until browned. Drain if needed.
Add thyme, oregano, parsley, salt and pepper. Mix well.
Transfer the beef mixture into a 6-quart slow cooker.
Add marinara, water, cauliflower and cabbage to the beef mixture. Mix well.
Cover and cook on high for 4 hours. When it's done, the cabbage will be soft and tender. Serve hot.
