You may want to check out the AU Online classes releated to ACA Details.
I had taken a previous version of Dennis McNeal's class, and I do not believe it got into recipes, but it may be worth having a look at his materials anyway:
http://au.autodesk.com/?nd=class&session_id=768
I have not taken Mikako Harada's class or read through the materials, but the course description mentions that it covers the writing of recipes.
http://au.autodesk.com/?nd=class&session_id=1136
David Koch
AutoCAD Architecture and Revit User
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