My boyfriend is planning an event for his engineering club and one of the members is Jewish.  He wants to figure out what to get that everyone can eat, so he needs to find something that follows Kosher rules and likely is also Halal (there is a Muslim member as well).  Halal is easier because he can eat something that is vegetarian if the meat is questionable, but Kosher rules are more complex.  Are there any chain restaurants (like sandwich places, tex-mex sort of places, pizza places, etc.) that are certified Kosher that they could get food from?

Sorry for my Kosher ignorance.  All I know is that pork is not allowed, non-Kosher meat is not allowed, fish is not considered meat, and meat and dairy are not allowed to mix.  I don't have any Jewish friends, so I've never had to figure out the rules or provide Kosher food.  Any advice would be great!