I'll be making my annual 10 gallons of kolsch this spring. I'd like to split the last five up into two batches and add some fruit to one of them, maybe both. I've always thought raspberry would be a nice touch. Has anybody used fruit in their kolsch recipes? I've never used fruit in any beer (save from extract). Sounds like puree is the way to go, but I'm not even sure the amount I would need in a 3 gallon batch?