Add the turmeric, ginger, 1 teaspoon sea salt, and cumin to a bowl and mix to combine.
Season the chicken on both sides with the spice mixture. Let the chicken rest for at least 10 minutes at room temperature.
Heat the ghee in a large stock pot over medium/high heat. When the ghee is melted, add the chicken. Sear the chicken for 2 minutes on each side. Remove from the pot.
Deglaze the pan with ½ cup of the chicken broth. Scrape the brown bits from the bottom of the of the pot. Add the onions, carrots, celery, and sweet potato to the pot and toss. Season with the remaining salt and saute for 5-7 minutes. Add the garlic, ginger, and lemon grass and saute for an additional 1-2 minutes.
Place the chicken on top of the vegetables and add 7.5 cups of broth to the pot. Bring to a boil.
Add the orzo, stir, and turn the heat to medium heat. Allow the orzo to cook and thicken the soup for 7-10 minutes or until the orzo is al dente. Remove from heat.
When the internal temperature of the chicken reaches 165ºF, remove the chicken from the pot and shred it. Transfer it back to the soup and stir to combine.
Remove the lemongrass stalk. Add the lemon juice and kale. Stir to combine. The heat of the broth should wilt the kale.
If the orzo has absorbed a lot of the broth, there's an option to add 2 more cups of chicken broth to make it more soupy. Heat over medium heat.
Garnish with fresh lemons and chopped parsley. Enjoy immediately.