Originally Posted by cheezydemon
My gut says none. No offense intended! I would say that you are in uncharted waters, so it really depends on how much flavor you want from the cherries. Are you wanting a hint? or to really taste it?
Uncharted waters? Why is that? Papazian has a recipe for a cherry stout in 'Joy of Homebrewing'- I think it calls for ~5#. Don't have it in front of me, but cherry stouts aren't that rare, right? I'd add the whole can. I would expect you to get a noticeable but not overpowering cherry flavor. Usually the quide is 1# per gallon, not sure for puree, I've only used fresh cherries.