I know a Kir Royale is supposed to be made from champagne and cassis. It sounds good but I've never had one. What would be the likely result if champagne was substituted for prosecco or cava and the cassis for...Ribena? The latter isn't blackcurrant liqueur so obviously no alcohol content and a good deal sweeter. Probably not a good mix.
I must buy some cassis and Chambord and try these things for myself.