O'Neills currently have an offer for anyone who becomes a fan of their Facebook page.
Go to the O'Neills Facebook Page deal tab, become a fan and you get a voucher which gives you two grilled 6oz Irish beef burgers topped with bacon & melted Irish Cheddar, or two spinach and lentil veggie burgers for the vegetarians. They also come with chips and are served with tomato and mayo in a floury bap. You can also upgrade to wedges fo 49p.
You can also download the voucher directly here.