Healthy Cream Of Mushroom Soup

Ingredients

• ⅓ cup uncooked wild rice
• 7 cups water, divided
• 1 onion, chopped
• 2 cloves garlic, minced
• 2 celery ribs, chopped
• 1 large head cauliflower, outer leaves removed, coarsely chopped
• 1½ tsp Himalayan salt, divided
• ½ tsp black pepper
• ½ tsp onion powder
• 1 tsp Dijon mustard
• 500g (1.1lb) mushrooms, chopped rather finely
• 1 cup plain Greek Yogurt
• 2 tbsp arrowroot flour