The site feels like a demo for geographical targeting, and I'm not seeing any evidence that the admin site would be worth looking at. Not sure if a real business or just a school project, so I'm going to decline.

If you can get a certain number of restaurants to participate from your home country, I'd limit the site to that. I got empty lists from Finland, but I know a site that has almost all the local pizza places that deliver, and another site with almost all the restaurants. There's multinational giants like takeaway.com, and similar idea has been pitched in the Dragon Den UK years ago. I guess market for these sites is pretty saturated.

I'm not sure why the back button doesn't work, but it's very annoying.