Brown the oxtail in 1 tablespoon of oil in a stock pot, then set aside the oxtail
Add in the remaining oil and saute the onions until soft
Add in the tomatoes, garlic and paste and mix together
Add back in the oxtail and the beef stock cube and cover with water
Cover and simmer until the meat is tender, this can take a couple hours.
Add salt and pepper to taste.
If making the dumplings, add them in the boiling stew about 30 minutes before the end of the cooking time.