Chicken Velvet and Spinach Soup

Name: Chicken Velvet and Spinach Soup
Ingredients: 1 pound boneless, skinless chicken breasts, cut into 1-inch cubes; 2 teaspoons arrowroot powder; 1 teaspoon Diamond Crystal kosher salt; 2 teaspoons ice water; 1 egg white; 1 tablespoon avocado oil, ghee, or fat of choice; 1 large shallot, thinly sliced; 1/4 pound large shiitake mushrooms, stemmed and thinly sliced; 1 (2-inch) piece of ginger, peeled and cut into thin coins; 3 cloves garlic, peeled and smashed; 6 cups bone broth or chicken broth; 2 teaspoons coconut aminos; 1 teaspoon Paleo-friendly fish sauce; 6 cups baby spinach; 1/2 teaspoon toasted sesame oil