Mash at 67C for 1 hour. Boil for 60 minutes with pureed blackberries added at flame out, make sure to strain the puree through a strainer to prevent seeds from getting into the wort. Ferment at 18C for 5 days, when the wort nears FG increase temp by 0.5C degrees each day till 20C is hit then wait for FG to be reached.