I’ve been working on a quick extension for a customer of mine and thought it may be useful for others… I’ll eventually release it to the marketplace but for now you can find it here:
https://github.com/ryanmitchell/ti-ext-customerswhoordered
It gives you an “orders” button on the customers page, and you can then view and export a list of who ordered what dishes during the time period you specify.
Hope you find it useful.