Put the pork along with the vinegar in a thick bottomed pan, add salt to taste, add half a glass of water and let it cook until half done. I also chopped some potataoes and added it to the pork while it was boiling. But you can leave it out if you want. Then add the tomato puree, ginger and garlic and let the pork cook until tender. When it is almost done, add the raja chilli and stir until the pork is cooked and tender. The curry will be a bright red thick gravy.
This tasted perfect with steamed rice. Enjoy.