Black pepper beef

• 250 g (9 oz) beef fillet or trimmed sirloin
• 50 g (

Slice the beef very thinly against the grain and coat each side with the ground pepper.

Layer the beef slices in a shallow non-metallic bowl, scatter with the onion and sprinkle with ½ a teaspoon of salt. Pour the vinegar over and allow to stand for 30 minutes.

Heat the oil in a heavy-based saucepan over high heat until it is just smoking. Cook the beef slices o