Yea, I've been digging through the documentation on the site, but so far it's not all that helpful. Great on making the templates work, but not so much for getting it to go to a file instead of STDOUT. Either that or I'm missing it.
Its definitely all there:
Documentation for the ->process method
By default, the processed template output is printed to STDOUT. The process() method then returns 1 to indicate success. A third parameter may be passed to the process() method to specify a different output location. This value may be one of: a plain string indicating a filename which will be opened (relative to OUTPUT_PATH, if defined) and the output written to; a file GLOB opened ready for output; a reference to a scalar (e.g. a text string) to which output/error is appended; a reference to a subroutine which is called, passing the output as a parameter; or any object reference which implements a print() method (e.g. IO::Handle, Apache::Request, etc.) which will be called, passing the generated output as a parameter.