1. It's a nasty tasting attempt to concentrate the flavors.
2. Add 1-2 lbs of frozen raspberries when you have 15 minutes left in the boil. You'll have to reset your timer when the boiling resumes and the beer will have a slight haze for the pectin.
If you do not want any haze, toss the berries in at the end of the boil and stir well before cooling.
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