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Mix together 1 tbsp oil, the garlic, chilli, half the mint and some salt and pepper. Rub all over the steaks, then if you have time, leave to marinate for up to 2 hrs.
Cook the pearl barley in boiling, salted water until tender, but not too soft, about 20 mins. Cook the beans and peas in the same pan for the last 2 mins. Drain really well, then tip into a large bowl. Add the red onion, remaining mint, lemon zest and juice, remaining oil, salt and pepper. Toss everything together.
Heat a griddle or frying pan until almost smoking and cook the lamb for 4 mins on each side for pink, or longer if you prefer your meat well done. Divide the barley salad between 2 plates and serve with the grilled lamb, drizzled with any pan juices.