I brewed up a fairly simple stout and it has been in the primary for about a week now. When racking to secondary I am going to add 2 scraped vanilla beans and blueberries. How much blueberry should I add to get a subtle berry flavor?
Jamil Zainasheff recommends .5 lbs of fruit puree/gallon of beer to start and adjust it from there. Since a stout is a bolder beer you may want a slightly greater ratio.
"Stay thirsty my friends"
-The Most Interesting Man in the World