In a large, lidded saucepan, heat the ghee or oil over medium-low heat. Add the turmeric, cumin, garam masala, ginger, and tomato paste. Cook for 2 minutes, or until a fragrant paste forms.
Carefully stir in the coconut milk, broth, lemon juice, and salt. Bring the sauce to a simmer and cook over medium-low heat until slightly reduced and golden in hue, 10 minutes. Fold in the chicken and continue to simmer over medium heat, stirring occasionally, for 10 minutes.
Place the lid on the pan and simmer for another 5 to 10 minutes, or until the chicken is tender enough to break apart with your spatula. Serve immediately with the cilantro as garnish.