Beer, can’t remember what it was though! I was also 15 (and 6′ 6″) so managed to get served in a couple of pubs until one of my elder step brothers was in and grassed me up to the landlord!.
Never been a “regular drinker”, I do enjoy a cider or even a nice cold shandy on a summers day!. Only been properlt drunk once, one night on holiday in Portugal in 1990 I went to a local bar and had a 3 or 5 beers with Vodka chasers, unfortunately these were Finlandia Export and about 1/3 of a tumbler!. Got back to the apartment and my heavily pregant wife wasn’t best please when I threw up!. Good news was I didn’t have a hangover the next morning 🙂
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!