Whenever I've had Belgians, I've tasted something metallic, especially in the aftertaste. It was especially strong in Lost Abbey's Judgment Day, a quadrupel. I thought it was something unique to me because no one knew what I was talking about, but today a friend said the same thing ("metallic", without me suggesting anything). What in the brewing process causes this taste?
In case it helps, I also taste it in Killian's Irish Red.