Using a large, heavy cast iron pan or stock pot, brown the ground beef over medium heat. Lightly season and use a wooden spoon to crumble. Once browned, set aside and leave about 2 tbsp of fat in the pan (or add avocado if needed).
Add the onion to the same pot and cook for 3-4 minutes or until lightly translucent. Add in the garlic, carrots, and cauliflower rice and cook for another 3-4 minutes to lightly soften. Stir in the cabbage and allow to wilt for 2 minutes
Add the beef back to the pot and stir in the broth, tomato sauce, lemon juice and oregano. Stir well and bring to a low simmer.
Allow to simmer for 30-35 minutes. The vegetables should be softened and the soup should lightly reduce.
Season the soup to taste and top with fresh parsley to serve.
Notes
All nutritional information are estimations and will vary. Estimations do not include optional ingredients.