This is a call to all restaurants, chain or non-chain: having a mobile optimised site is an absolute must for driving the ravenous hordes through your doors.
Whether it’s a separate mobile-site, a responsively designed site or an adaptive one, if you want to capture the attention of the empty stomach as it wanders the street getting progressively more hungry-angry (hangry) then you have to provide a decent mobile presence.
Other restaurants may not necessarily be better than yours, but will they will beat you in the dinner rush if your website remains in its desktop form.
You don’t need a fully featured work of creative genius, just a simple, functional, easy-to-read, easy-to-navigate site that puts the most vital information to the fore.
Personally I believe the most necessary information or features that a restaurant’s mobile site should provide are as follows: