Xingu is a somewhat complex drink. I love that stuff. Never noticed a sour apple note though.
I've found that it can taste slightly different from bottle to bottle.
I haven't had it in a while. Now that it comes in 6x12, I think I'll see if the same holds true.
Plus, now that eu jogo capoeira, it just seems fitting.

(That's Brazilian Portugues for "I ache all over".)