According to the washingtonbeerblog

Attention sour beer aficionados. Today (June 18) at 3:00 Best of Hands Barrelhouse releases a new oak-aged sour beer. Jack Rabbit’s Palace is described as a foeder-aged, mixed-culture saison fermented on blueberries and sage. Bottles released today, draft version forthcoming. The complete description is the release notice below.

Oak aged sour ale blended with new American oak foeder aged mixed-culture saison, refermented on blueberries & sage. Gorgeous burgundy color with a pillowy white head which dissipates quickly.

Read more at source: washingtonbeerblog