How long has the beer been in the bottles? Honestly I have noticed a lit of green (young) beers, especially all grain, or partial mashes taste like grainy ice tea until they have carbed and conditioned for a few weeks.
I noticed the exact same thing in my Nut Brown beers when I used to squeeze the grain bag. It always aged away. You are tasting green beer, I'd be willing to bet on it.
I say "used to" because I switched to all-grain. Now I worry about tannin extraction from over-sparging instead of bag squeezing. Something new to worry about. I should RDWHAB...
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