The cannibalism ability is acquired by doing the quest chain A Taste for Death which begins in the Markarth Halls of the Dead. 

Upon completion, the player received a Ring of Namira. 

While this ring is equipped, the player can feast on human corpses and also craft the cannibalism cooking recipes.

If you wish to have this ability always active, you can use the console command "player.addperk ee5c3"

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If you wish to remove the cannibal perk check from the crafting recipes, simply open the .esp files in TESsnip and delete the "CTDA" subrecords under the COBJ records. However, you will have to redo this editing each time the cooking pack updates.
