Place the rice in a bowl and cover it with hot water. Stir the rice well and discard of the water. Repeat the process two more times. Transfer the rice to a strainer, and rinse under running water. Set aside.
In a medium saucepan, combine 2 ½ cups water with the soup powder. Add the chicken and bring to a boil. Add the tomato paste, turmeric, salt and pepper. Lower the heat and cook for about 30 minutes. Remove the chicken from the pot and set aside.
Add to the pot 1 ½ cups of sour grape juice (or water) and the rice, and cook over low heat, stirring occasionally, until all liquids are absorbed in the rice, about 30 minutes.
In a large sauté pot, heat the oil and sauté the coriander seeds for 2 minutes. Add the onion and sauté for 3 more minutes. Add the cooked rice, the remaining ½ cup water, and the chicken, and cook covered, over low heat, for 50 minutes.
Plate the rice on a serving platter and place the chicken pieces on top. Serve hot and enjoy!