Caching pages with URL parameters

[pub crawler]

Managed to work though my earlier Varnish issues with help from the
list.  Thank you!

Have another likely obvious question.

Most of our pages use a flat - fake non-appearing to be dynamic
format.  Like this:
http://www.website.com/Template/dsp_restaurant_zoom.cfm/flat/ID=460401

For some reason we can't get Varnish to cache these pages.

In sub vcl_recv I have this:
if (req.url ~ "dsp_restaurant_zoom.cfm") {
        unset req.http.cookie;
        lookup;
}

Anyone have any ideas of how to get these pages cached?

Thank you!
-Paul