Heat a little butter in the pan, put it on the chicken and fry on all sides until brown. Remove meat. Add chopped onion to the pan, fry to soften. Add the crushed garlic and ginger slices, fry it while spices are mixed. Returns meat with onions. Pour the car, add ketchup (puree) and mix. Cover and leave to simmer until sauce thickens - about 45 minutes. Stir so that the chicken well be watered from all sides with sauce. Add soy sauce to taste. Sprinkle with parsley and serve with rice or other appropriate garnish.