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Tip the potatoes into a pan of water, bring to the boil, simmer for 2 mins, then drain. Heat the oil in a non-stick frying pan. Add the potatoes and sizzle gently for 20 mins, tossing occasionally, until golden and crispy all over. When the potatoes are cooked, add the garlic to the pan and fry for 1 min more. Finally, toss through the parsley, season with sea salt and set aside.
Meanwhile, rub the steaks with a drizzle of oil, then press in the black pepper. Heat a griddle pan until hot, and cook the steaks to your liking (2½ mins each side for medium rare, 3½ mins for medium, 4½ mins for well done). Leave steaks to rest for 5 mins, then top with a knob of butter and serve with the potatoes and some watercress salad.