Place the onion, garlic and ginger in a food processor and process
until a thick rough paste is formed.
Heat the peanut oil and sesame oil in a large pan; add the paste and
cook it over medium heat for about 15 minutes until it becomes a golden
brown color and has oil around the edges.
Add the chili powder, turmeric and pork and stir well for a few
minutes until the pork is well coated with the mixture.
Add the vinegar and water, cover and simmer gently for 1 1/2 hours
or until the meat is tender.
If necessary, reduce the liquid by removing the lid and allowing the
sauce to evaporate.
Season with salt to taste and scatter over the coriander.