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Heat oven to 200C/180C fan/gas 6. Brush the tortilla with a little oil, then bake on a baking sheet in the oven for 6-8 mins until crisp.
Meanwhile, rub a little more oil over the steaks and generously season. Heat a griddle or frying pan until hot, then cook the steaks for 1-2 mins each side, depending on the thickness of your steak and how you like it cooked. Remove from the pan and rest on a plate while you get the other ingredients ready.
Stone and peel the avocado, then thickly slice. Whisk the mustard mayo with the remaining oil, 2 tsp water and the resting juices from the steak. Break the tortilla into pieces and slice the steak, trimming off any excess fat. Divide the salad between 2 plates, top with the avocado, tortilla pieces, sliced steak and finally drizzle with dressing.