Its not a good way to rely on 3rd party services, as its a waste of time and money. Instead launch a minimum viable product designed by programmers and then you can extend it the way you want.
These type of projects are both time and cost consuming. The cost to develop a site fully functional as foodpanda will be around 3.5 to 4 lac when developed from a small and reputed web development firm.
I am a freelance web developer and specialist in making social networks, ERP and CMS scripts. I can develop a script for you which will contain Menu and Ordering system similar to foodpanda. Also If you have a table booking in your restaurant, I can provide with that also.
So if you are interested contact me @ http://www.dwebpixel.com