In the meantime, remove the chicken from the bones and cut into small pieces. Dice the onions.
Heat the margarine in a pan and fry the onion cubes until translucent. Then add the chicken and fry a little. Add the rice and stir well. Let rest a little and then add the clear broth. Simmer gently, stirring occasionally. Season to taste. Finally stir in the sour cream and bring to the boil again. Try and maybe season again. Serve.