Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
 450      gram          beef -- rump steak
   2                    onion
  75      milliliters   vinegar
   1      teaspoon      salt
   1      teaspoon      pepper -- black, coarse grind
 100      milliliter    oil
   1                    curry leaf sprigs
   2                    cg cinnamon stick
   1      teaspoon      mustard seed -- ground
 100      milliliter    stock
   1      teaspoon      sugar
     1/2  teaspoon      chile powder

Preparation:

Slice the beef into 50mm slices. Make onion rings with 1 1/2 onions and chop remainder. Mix together the vinegar, salt and pepper in a bowl and marinate beef for 1 hour. Heat the oil in a frying pan and when hot add the curry leaves, chopped onion and cinnamon stick. When fragrant add the beef and marinade. Cover pan and cook over a low heat until the beef is tender. Remove the beef and set aside. Add the onion rings to the pan and stir fry for a couple of minutes. Add the mustard, stock, sugar and chile powder and mix well. Put back the beef slices and cook for a further 2-3 minutes. Remove the cinnamon stick before serving.