Method
1. Fry the steaks in a large frying pan with a knob of butter - give them 4
minutes on each side for a medium rare finish.
2. Remove the steak from the pan and place on a hot plate, cover with aluminium
foil and set aside in a warm place.
3. Meanwhile, fry the onions in butter with sugar and use the same frying pan
until golden-brown and caramelised. Add the remaining ingredients and simmer
until thickened. Serve the steaks with the stout sauce.
