I hate to be that guy, bumping an old thread and all that.
Did you try it? I'd like to brew a naturally caffeinated Pale Ale, and I'm debating between using coffee beans or yerba mate. Probably do a test batch of both, but I'd like to see if anybody's tried it.
5 gal hopped test braggot
5 gallon unhopped test braggot
Medieval Ale, High Gravity Fruit Braggot, Medium Sweet Vanilla Braggot, Ancient Gose, Triple-Hopped Caffeinated Ale