The Order of Saint Bruno, also known as the Carthusian Order, is the strictest order of Catholic monasticism – you can think of them as the Navy SEALs of monks.
I did some work in Grenoble, France, and this gave me the chance to drive by the most famous Carthusian monastery, in Chartreuse.
There is an erstwhile Carthusian monastery not too far from where I live,
and they still grow hops used for a local beer that they brew