The 'suckers' on squid tentacles seem to each have small shell-like (chitinous?) 'rings' inside them that can be removed by pulling or rubbing the tentacles. This takes a lot of time and I am wondering if it is necessary?
Also, how much of the mouth/head is generally good to eat? It seems that the ring where the tentacles connect is quite edible but there are also some much harder/tougher parts of flesh nearby.