We have Carl's Jr...which is the West Coast version of Hardee's. We don't have a Frisco Burger though.
I looked it up at it looks like it's just buttered sourdough, bacon, swiss, tomato, the burger and onion flavored mayo.
I'd go get yourself some sourdough slices, the other ingredients and throw some lipton onion soup mix into some mayo and spread that on the bread.
at 2:46 PM on Feb. 26, 2010