Using a sharp knife, make sure the meat is clean and all excess fat is removed.
Place your pressure cooker on medium heat, add the water, vinegar, and meat, let it cook on high pressure for 25 to 30 minutes.
Simmering on Stovetop
Place the pot on medium heat, add the water, vinegar, and meat and simmer for about 20 hours or until meat is tender.
Add the potatoes to a saucepan and cook for 30 minutes until the potatoes are tender.
In a separate pan, heat the oil and fry the onions until glossy and starting to caramelize, add the garlic and spices and stir-fry for a minute or two, then add the green beans and stir-fry another minute.
Chop the tomatoes and add to this mixture, season well.
When the curry sauce is ready, add the potatoes and the curry sauce to the meat and simmer until the sauce is glossy and everything is cooked through( You will need to check the seasoning).