Sounds like a Cornelius Stirk comic. He cooks organs to get nutrients and hormones from them.
Cornelius_Stirk_1.jpg
https://en.wikipedia.org/wiki/Cornelius_Stirk
So it's probably one of these: My blind but best guess is Tec 592-593. Which are in
Legends of The Dark Knight: Norm Breyfogle Vol. 1
....just released last month.
Cornelius Stirk Chronology:
Detective Comics #592 (November 1988): "The Fear Part One"
Detective Comics #593 (December 1988): "The Fear Part Two: Diary of a Madman"
Batman: Shadow of the Bat #1 (June 1992): "The Last Arkham, Part One"
Batman: Shadow of the Bat #3 (August 1992): "The Last Arkham, Part Three"
Batman: Shadow of the Bat #4 (September 1992): "The Last Arkham, Part Four"
Batman #494 (early June 1993): [Knightfall 5]: "Night Terrors"
Showcase '94 #3 (March 1994): "Madmen Across the Water"
Showcase '94 #4 (April 1994): "Madmen Across the Water"
Batman: Shadow of the Bat #46 (January 1996): "Cornelius Stirk, Part One"
Batman: Shadow of the Bat #47 (February 1996): "Cornelius Stirk, Part Two"
Creeper #7 (June 1998): "Madhouse"
Creeper #8 (July 1998): "He Who Laughs Last"
Batman: Shadow of the Bat #80 (December 1998): "Road to No Man's Land: Wax Man and the Clown"