Wash and soak 1 cup basmati rice for 15 minutes. Drain.
Cook rice with water and salt until 80% done. Drain and set aside.
In a bowl, mix 400g chicken thighs with ¼ tsp turmeric, 1 tsp chili powder, 1 tsp salt, and juice of 1 lemon. Marinate for 15 minutes.
Heat oil in a pan. Add cinnamon sticks, cardamom pods, cloves, bay leaf, and cumin seeds. Sauté for a few seconds.
Add marinated chicken to the pan. Cook for 3 minutes.
Add chopped garlic, ginger, and slit green chilies. Cook for 2 more minutes.
Add chopped onion, tomato, coriander leaves, mint leaves, and 1 tbsp tandoori masala. Mix well and cook for 1 minute.
Spread chicken mixture evenly in the pan.
Add partially cooked rice on top. Garnish with more mint and coriander leaves.
Add butter, sprinkle extra tandoori masala, splash ¼ cup water.
Cover and cook on low flame for 20 minutes or until rice is fully cooked.