Cut the chicken to four and the onions into small pieces. Heat the oil and butter in a saucepan and add the chicken and onions.
Cook them for some time.
Melt the tomatoes and add them to the chicken with some water,salt,pepper,spearmint,
(If the liquid in the pan is not enough,add some hot water). When the pasta is ready ,
add the walnuts , stir, and serve immediately.