It's an old synonym for "recipe" as well as a paper acknowledging that something's in hand
[DOC] [TLE] Inform Recipe Book - Inform 7 [PAR] Preface The Inform Recipe Book is one of two interlinked books included with ... it 
would grow far too long and be a constant labour to maintain, but it's well worth ... 
time Inform describes a group of objects (as in "You can see 27 paper clips here.