Preheat your oven to 350F. Place onions, mushrooms, bell pepper, brussels sprouts, palm oil, salt and pepper on a large baking sheet. Transfer sheet to the oven and roast vegetables for 25-30 minutes. Once complete, set aside.
Add ground beef to a large soup pot and cook on medium-low heat until just cooked through. Add garlic and celery, cook for another 3 minutes. Do not drain the fat, keep it in there.
Add remaining ingredients: stock, tomatoes, paste and spices. Bring to a boil, reduce heat to low and simmer for 15-20 minutes.
Stir in roasted vegetables and chopped parsley. Serve with a slice of Flax Focaccia.
Recipe by Healthful Pursuit at https://www.healthfulpursuit.com/2015/01/8-of-the-best-low-carb-soups-you-should-be-eating/