Mince the onions , tomatoes, red and green chillies .
Cut the potatoes into halves. Mix them with little turmeric.
Mix the chicken with 5 Tbspns of mustard oil, remaining turmeric, cumin powder, cumin seeds, onions, tomatoes, chillies, ginger-garlic paste, vinegar, soya-sauce, bay leaves(torn to pieces),sour curd.
After the mixture has been prepared well, place it under refrigerated/ non refrigerated with lid closed and allow it to marinate for 30-45 minutes
Fry the potato slices in mustard oil with lid closed till they become soft.
Put the mixture along with the fried potatoes and continue stirring on a medium-low flame intermittently with lid closed , so that the chicken becomes soft.
Add little amounts of water each time and finally submerge the entire content in water and allow it to be cooked for around5-15 mins
(The higher time allowed for marination the lower time will it take to cook)
Garnish it with Garam Masala and cilantro leaves .....and keep it closed for about 3-5 minutes