Prune Juice - A mini rant

What the crap is prune juice? Aren't prunes dehydrated plums? Is it just plum juice? Then why not call it plum juice? Nobody says raisin juice when they mean grape juice. Raisin paste is a thing. Check your steak sauce if you don't believe me. But I don't think that Worf would drink a glass of plum paste. You'd need a spoon for that. Maybe make a prune shake. You'd need a spoon for that, too.