We first encountered sidra, cider, in Basque Country but it is big all along the north coast of Spain. It is carbonated and the tradition is to pour it from on high.
We learned that you only pour as much as you will drink in a few minutes, at most one inch, at a time. It is pretty sour, not sweet like some ciders. I didn’t like it when I first tried it a few years ago but this trip I have acquired a taste for it. Wynette doesn’t like it, more for me, except you often have to buy a whole liter bottle which is four times what I drink.