Hi Pappy...I had a similar idea a while back and I even registered the following domain names, however, I have neither had time to follow-through nor find a good way to execute the business.

SpecialLunchMenu.com
LunchObsessed.com
LunchTimeSpecials.com

Also, take a look at the following site, I think this person is doing something similar to what you want to do:

http://www.lunchspecials.net