Place the marinade ingredients into a mixing jug and mix well until the sugar is dissolved. Put the steaks into a plastic food bag and pour the marinade on top. Fold and seal the bag in a way that the steaks are completely covered in marinade and leave in the fridge for around two hours.
Heat a non stick frying pan, then remove the steaks from the marinade and seal for 1 minute on both sides, the sugar in the marinade will make them caramelised almost instantly.
When the steaks are sealed place them onto a baking tray. Pour the remaining marinade into the frying pan and boil it for 2 minutes, then pour this sauce over the steaks and place in the hot oven for 8 minutes for medium, longer if you prefer them well done.
While the steaks are cooking, blanch the green beans in boiling water for 1 minute, then run under cold water.
Heat the oil in a clean frying pan and stir fry the garlic, chilli and green beans for 2 – 3 minutes, season with salt and pepper. Put the beans into a serving dish and keep warm until the steaks are ready.
When the steaks are cooked, remove from the oven, cover with tinfoil and rest for 2 minutes.
To serve arrange the beans on warm serving plates, top with the steaks and pour over the sauce.