I just checked, it is 'Low Magick' by Lon Milo DuQuette. The entirety of Chapter 11 is on 'Pop Goes Ganesha'. It might sound a little irreverent, but here is a snippet from the book --

> I first created it to be a whimsical meditation that I could quickly perform mentally to begin and end my morning routine, but it soon became for me something more. In fact, within the context of its goofy simplicity, I have found not only a powerful banishing ceremony, but also a profound and breathtakingly effective technique of invocation.

DuQuette is a great author (Chicken Qabalah, Magick of Aleister Crowley, especially) with a good sense of both humour and the serious, and I'd highly recommend checking him out.