Green’s Dictionary of Slang

carnish n.

[Ital. carne, meat; imported via Ling. Fr.]

1. (UK Und.) meat.

[UK]Hotten Sl. Dict. 94: CARNISH, meat.
[UK]Sl. Dict.
[UK]P. Baker Fabulosa 290/1: carnish food, often meat.

2. (Polari) human flesh.

[UK]R. Milward Man-Eating Typewriter 39: [She] cat-o’-nine-tailed my naggy carnish.

In compounds

carnish-ken (n.)

(UK Und.) a thieves’ eating-house; thus cove of the carnish-ken, the owner of such a place.

[UK]Hotten Sl. Dict. 94: carnish-ken, a thieves’ eating-house; ‘cove of the carnish-ken,’ the keeper thereof — North Country Cant.
[UK]Barrere & Leland Dict. of Sl., Jargon and Cant.
[UK]Farmer & Henley Sl. and Its Analogues.
[Aus]Crowe Aus. Sl. Dict. 15: Carnish Ken, an eating house.
[UK]P. Baker Fabulosa 290/1: carnish ken an eating house.