Skyblade used impressive thinking, but sadly not right. Weimar, very good logic, and getting very close to answering this, however you seem to have assumed a link between the instructions of the plums and the blood which isn't there. I may have been misleading in a clue somewhere in that respect, so if I was I apologise.
As for the form of the answer, that should be fairly clear once you work out what it is. I don't have anything specific in mind.
EDIT: If you are going to use the entire riddle, I should make two warnings. One is that there is a twist that I put in to make it harder to solve. Two is that you have to assume something about the plums, which might be less obvious than for the other nouns.
