I continued my first sour/Brett/fruit/wine yeast experiment by racking the beer onto some cranberries I picked up fresh last fall that I sealed and froze. The primary yeast (a wine yeast, Lalvin BM45) had fermented the beer down to 1.022 and the sample I took tasted very nice - clean, a bit fruity. It was still very cloudy and I must admit not nearly as sour as I thought it would be with all that acidulated malt in the grist. With the Brett and cranberries I figure the acidity will jump up some.
Not sure that I had to or should, I pasteurized the cranberries, still in the vacuum sealed pouches, in 165°F water for about 20 minutes. I then mashed them up and dropped them into the carboy, which more difficult than I anticipated. I then racked the beer on top and set the whole thing in my basement for 24 hours before pitching a vial of WLP645 - Brettanomyces claussenii. I went with this strain because I didn't want an overpowering Brett character. I'll let this sit undisturbed for a while - 3 months maybe? At the moment I am thinking of adding some oak cubes as well - I have 0.5 ounces soaking in some red wine that I might add at some point.