Step 1 Place the water, tomatoes with juice, chicken, red pepper flakes, onions, salt and pepper to taste in a heavy-bottomed pot with a lid. Bring to a boil and immediately reduce the heat to a simmer. Simmer 20 minutes and turn the chicken pieces over. Add more tomato juice or water if too much liquid is evaporating and the chicken is drying out.
Step 2 Add the parsley and rice. Be sure there are 2 cups of liquid in the pot; if not, add more tomato juice or water. Stir until the ingredients are well mixed. Cover and simmer until the rice is tender and the liquid is absorbed, 15 minutes more, checking once or twice to make sure all the liquid hasn't been absorbed by the rice. It should be quite moist, not soupy. (Add some boiling water if it has become dry.) Taste and add more salt and pepper, if needed. Serve hot.