Prepare tandoori paste following the recipe instructions. Set aside. Place chicken in a large bowl. Add half of tandoori paste. Coat chicken with the tandoori paste. Cover and marinate in the refrigerator for 30 minutes.
Rinse rice 3-4 times until water runs clear. Place in a bowl. Cover with water. Soak for about 20 minutes. Drain. Set aside.
Preheat oven to 180C / 350F.
To a 8x12 inches baking dish, add onions, bell peppers (capsicum) and garlic. Mix.
Arrange chicken on top of the vegetables in a single layer.
Pour chicken stock (broth). Add remaining tandoori paste. Mix.
Cover tightly with aluminum foil. Bake for 20 minutes.
Remove chicken from baking dish.
Add rice, coconut milk and oil. Mix. Season with salt.
Arrange chicken on top in a single layer.
Cover with aluminum foil. Bake for 30 minutes or until the water is absorbed, rice is fluffy and chicken is cooked through.
If chicken is not cooked through, replace foil and bake for another 10 minutes.
Garnish with coriander (cilantro) leaves.
Serve with raita, pappadums and mango chutney.