Green’s Dictionary of Slang

1. (US Und.) to satisfy one’s addiction by smoking opium.

1910

Wash. Post 3 July 3/1: As long as he’s free and has the price he’ll cook off his desire.

2. in bootlegging, to heat the mix of alcohol and other ingredients preparatory to distilling spirits.

1977

(con. 1960s) D. Goines Black Gangster (1991) 114: You should be cookin’ this batch off . . . this weekend.