Apologies in advance. I know this has to have been asked before but I couldn't find anything.
I just racked 6 gal to secondary and am starting to think about how I want to finish the cider. After tasting it before going into secondary, there seems to be very little "apple" flavor. I have 1 gal of frozen unpasteurized sweet cider that I was thinking about using to add apple flavor and backsweeten. Are there any guidelines on quantity to use.