To make this cabbage soup recipe in the crockpot, heat a large nonstick skillet over medium heat.
Add oil, and cook onion, bell pepper, and celery for about 5 minutes, or until softened.
Add garlic and cook for 1 minute. Transfer to the slow cooker.
Stir in all the other ingredients for the cabbage soup diet recipe, except spinach, lemon juice, and salt.
Secure lid and cook for 2-4 hours on high, or 8-10 hours on low.
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