I racked to keg with 1/2 cup corn sugar about 5 weeks ago, and it is very delicious. This is getting tastier by the day.
It is fairly malty, not sure if this is just the way mine turned out or what but I like it very much (I used marris otter also).
The mint character is very subtle but then again I put whole leaves in secondary without any chopping whatever, so you could split the leaves into quarters and get more mint flavor if you prefer. I am looking forward to getting another batch of this going soon....
