Graeter's Ice Cream in Ohio http://www.graeters.com/ makes some of the best ice cream I've ever eaten. My favorite Graeter's flavor is black raspberry with chocolate chunks. As an homage to Graeter's, I decided to add some chocolate chunks to TWD Blueberry Sour Cream Ice Cream. I couldn't decide wheter to use dark or milk chocolate. My thought being the milk chocolate would balance the sour cream flavor in the ice cream better than the dark chocolate. The chocolate didn't really impact the flavor but added to the texture and "mouth-feel". The key to working with the chocolate was to add it to the ice cream machine just before it's finished.
As others noted in the P&Q, the sour cream flavor was strong, not exactly what you expect in ice cream. Check out http://culinarycuriosity.blogspot.com/ for the recipe for Blueberry Sour Cream Ice Cream.