Heat a few tablespoons of oil in a deep pot. Add the chicken and fry on both sides until it is cooked. Then remove the chicken and set aside. In the same pan fry onions and garlic and mix well the tomato paste. Boil for several minutes, reducing heat and then put the chicken in the pot adding the peanut butter. In order not to burn all sure you use a very low heat. Add water to make tomato paste and peanut butter sauce smooth. Add spices to taste, stir and cook until the chicken is ready.