Remove the steaks from the fridge at least 20 mins before cooking.
Brush the steaks with 2tsp for the oil on sides, season and brush with mustard all over. Cover and leave to one side.
To cook the caramelised veg, heat the remaining oil in a large non-stick pan and cook the onions and mushrooms for 4-5 mins under a low heat until soft. Add the sugar and balsamic vinegar. Cook for a further 5 mins until slightly caramelised. Remove from the heat and transfer the mixture to a small bowl.
Meanwhile to prepare the relish, in a small bowl mix together all the ingredients together and set aside. If you prefer a bit more of a fiery sauce, stir through some dried chilli flakes.
Return the same non-stick pan and heat until hot. Cook the steaks for the 2-3 mins on each side (for Medium), Serve with rolls, fries or wedges and extra relish.
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