Par-boil the potatoes in water for about 5
minutes.
Peel and cut into cubes. Heat the oil in a frying pan, sauté the
potatoes until browned and set aside.
In the same pan sauté the green pepper and onion briefly, add the beef
and tomatoes, and, when the meat has browned, add the potatoes and a
little beef stock and bubble for about 20 minutes until the meat is
tender and the sauce is reduced.
Season to taste with salt and pepper and sprinkle with coriander just
before serving.