They may have perfected making Burgers from Stemcells or whatever but we'll guarantee that the burgers we give away free when you buy 2 bottles of beer or cider here at XXI tomorrow night will be made of real meat !!!unless of course you're a veggie then we'll cook you a veggie one!. Our regular Thursday night FREE BBBQ starts at 6pm. Free Burger when you buy any 2 bottles of beer or Cider. - Corona and Desperadoes are 2 bottles for £5 and Koppaburg or Magners are 2 bottles for £6.