[yiggydyang]

I would start with Yelp and Open Table. There must be conferences that restauranteurs attend. People who either sell food (farmers markets, organic specialty sellers), restaurant supplies, or POS systems would probably appeal to restauranteurs as well so perhaps go talk to them.

You could probably start by just dropping by a number of them during the day when they're not as busy (i.e. after lunch). If they like what you're building I bet they could point you in the right direction towards other restauranteurs.

Good luck!