Heat oven to 200C/180C fan/gas 6.
Put the potato wedges on a baking tray
and rub with the oil. Sprinkle the sesame
seeds and some seasoning over. Bake
for 25 mins or until crisp at the edges.
In a small bowl, mix together the miso,
lemon juice, chilli sauce and mirin. Rub
the steaks with a tiny bit of oil and some
seasoning. Spoon 1 tbsp of the sauce
over each steak and rub into both sides.
Heat a griddle pan until really hot, cook
the steaks for 2 mins each side, or longer
if you prefer it well done. Brush more
of the sauce over after you turn them.
Transfer to a plate, cover loosely with
foil, and leave to rest for 5 mins. Serve
the steaks sliced, with extra sauce, the
potatoes and watercress.