Grind it up, throw it in a pan, and toss it on a pyre. With luck, the food will be ready before your patron eats you.
Destro Only - Talk to Nathore Gristlechewer at 56.7,39.4 in Ostland while having a Portion of Ghoul Meat in your inventory. Portion of Ghoul Meat drops from Ghouls in Norsca. The Portion of Ghoul Meat will disappear when you receive the unlock.
This tome unlock contributes to the Ghoulish Gourmet pursuit.