The Twentieth Century is a superb, and, yes, elegant cocktail, if you can get the lemon/chocolate balance right. Unwittingly, my trials led me back to the Tuck ratio of 2:1:1:1, although I do tend to scant the lemon juice a little. Hitting the opening zing of lemon, followed by the suavity of chocolate is a difficult trick, as one is a strong, dominant "short" flavour; the other a perfumed, insidious "lasting" flavour. But when you hit the G spot, this is an outstanding and sophisticated drink.