From Sabrina Ghayour's "Feasts"
Make the pickle - dead easy, slice the onion into thin half moons, pop in a bowl with the vinegar, chilli and honey - and leave to soak for thirty minutes or so.
Rub the harissa paste into the steak and lie flat on a plate, leave for an hour or so to marinate.
Cook your steaks however you like - we like it medium-rare.
Thinly slice your cooked steak.
Make up your sandwich - hot meat, pickled onion and green salad - yum!
