Heat a soup pot over medium along with 3 tablespoons of ghee. Add the onion, carrots, cauliflower, celery, zucchini, pepper, mushrooms, ½ teaspoons salt, and a few cracks of pepper. Cook for 20 minutes until the veggies are very soft. Add the tomato paste and cook another 3 minutes. Add the parmesan rind, bone broth, fresh herbs, and bring to a simmer, cover the pot and cook for 30 minutes.