I did a quick look and you can get the marinade and dipping sauce mixes on Amazon for anyone else that wants to try it.
http://www.amazon.com/s/ref=nb_sb_ss_i_1_13?url=search-alias%3Daps&field-keywords=swiss+chalet+sauce&sprefix=swiss+chalet+%2Caps%2C157
Thanks for the tip, Bosco. I'll do that next time. When I mixed up the dipping sauce, it has a Worcestershire sauce aroma, so there might be some of that in the mix.