Dont eat the san pedro! you will get real fucking sick. It has strychnine in it.
to avoid the sickness you have to cutout the prickles, then you will notice a weird kinda plastic skin - peel it all off. Now you wantto cut off all the green flesh, leave the core behind, thats what makes you sick. Boil the green shit as long as you can 12 - 18 hours, then if you still have the patience freeze it but it dont really matter if do. Then consume, yummy! (kind of)