Cut pork into chunks (4 large pieces) and wash. Add crushed ginger /garlic, salt and vinegar and boil for 20 minutes adding very little water. When cool, slice pork into thin slices. Fry these slices till light brown on both sides.
In the same pan (remove excess oil) fry the thinly sliced onions, capsicum and green chillies for 2 minutes. Add bafat powder, pepper powder and soya sauce and chilli sauce. Mix well.
Add the fried pork to this mixture and let it cook for 5 more minutes.