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I had to go back and read why I thought this needed to be aged. It seems the sourness wasn't sufficient -- it was all herbs and fruit and lacked tartness. Well that has definitely changed. It's gone full-on Flemish with a sharp and savoury tang that's not quite vinegar at this stage but is headed in that direction. It's a waxy twang, with lots of oak and a hint of saltpetre, showing definite attributes of Belgium's finest sour beers. The cherries, herbs and balsam resins are still there in abundance, and there's a thick boozy kick which interferes with things a little but is to be expected given the strength.
This was a very worthwhile experiment. The beer has really come into its own in its time in the fridge, much as I hoped it would. It is no longer an Irish approximation of a foreign style but something that genuinely tastes like it was aged in big foeders in a brewery that's been doing this sort of thing for decades. All you need is time.