i learned something new so i'd thought i would share. Yards makes a terrific oyster stout. harpoon made a limited batch oyster stout a while back and i also enjoyed it. now that i brew, i was looking to make one. There didn't seem to be much help on the subject on here. mostly people saying how gross it was. well i went straight to the source to get an answer, and Yards answered. apparently oyster stouts do not contain the oysters themselves at all. it is an ode to an English style which used the shells to add calcium carbonate into the mix. boil the shells only for the first 10 minutes and you have an oyster stout.