Were you going to use it to sweeten up the brew at all or just to add some apple to the flavor profile? Unless the cider has preservatives it will start fermentation up again, so to me you could even throw it in when you go to pitch the yeast. I've never made that kind of beer before but it sounds interesting, what kind of malts and hops were you using? If the cider is natural, you could throw some potassium sorbate into it and let it sit for a couple of days so it will prevent the yeast from reproducing.
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