Wasn't it common for monks to drink beer while fasting?
Yes, bock beer.
Bock is historically associated with special occasions, often religious festivals such as Christmas, Easter or Lent. Bocks have a long history of being brewed and consumed by Bavarian monks as a source of nutrition during times of fasting.Traditional bock is a sweet, relatively strong (6.3%–7.2% by volume), lightly hopped (20-27 IBUs) lager. [