Serve with chips and the steak spooned over with this marinade sauce:
1 large shallot, chopped
150g small cherry tomatoes, halved, or 3 medium tomatoes, deseeded and chopped
3 tbsp tomato ketchup
2 tbsp Worcestershire sauce
1 tbsp grain mustard, optional
½ lemon, juice only
1 tbsp balsamic vinegar
1 tbsp olive oil
Small handful tarragon leaves, finely chopped
Simply mix everything together. This can be done the day before, then kept covered in the fridge until required. Remove the sauce from the fridge at least 30 mins before serving.