I'm still waiting on my first fruit beer to clear, but I had to research this when I was prepping for it. Some people wash fruit, crush it, and toss it in, since in the secondary there's going to be a lot of alcohol and competition from yeast to discourage other bugs: others like me finds that makes them nervous. I gather you get the best flavor extraction + sanitation from berries by freezing them to break cell walls, then pasteurizing at 160F(do not boil) for 10 minutes. I've also heard of washing the whole fruit in sanitizer, draining, and pureeing, or also mixing it with crushed campden tablets to kill wild yeast and bacteria. So, take your pick.
If the fruit's been heated and especially boiled, pectic enzyme will prevent haze in the finished beer, though some fruits have much more pectin than others. I don't know where cherries are on the scale.
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