Heat the oil in the wok. Throw in the unions and fry until they are golden brown.

Add the tomatoes and stir well.

Add cinnamon stick, cardamoms, peppercorns, cumin seeds, ginger, garlic, garam masala, chili powder and salt. Lower the heat and cook for 5 mins.

Add the chicken pieces, cover the wok with lid. Check occasionally and stir fry for at least 7 mins or until the spice mixture has completely penetrated the chicken pieces.

Add the yogurt in.

Lower the heat and cover the wok with lid. Cook very gently for about 20 mins.