It would depend on how lazy I was. For the fruits I’d heat them to 158F (70C) for 15 minutes while stirring constantly. But I’ve also been completely lazy and dumped in the blueberries without treating them in any other way besides freezing them. Since it’s in secondary and I tend to make higher abv beers I’m sure even that was most likely over kill. And it depends, my favorite is my chocolate hot pepper imperial stout, but my black berry Belgian triple was also really good. I think the only one I wasn’t a fan of was the kiwi, but I think it’s because I added too little to my beer to impart a significant taste, or I didn’t do the right base beer (I think a sour kiwi beer would be good but I haven’t made fermented beer in a while)