You flip through the menu on your phone and then order with a waiter. When done, you pay online via Apple Pay or whatever you want. Instantly and with tips.
Just a couple of companies do provide this service here in Ukraine and both managed to get the UI/UX just right so the experience is excellent.
Visiting Europe, I see so many absolutely brain-damaged implementations of online menus that I have to ask myself whether the developers ever used their product or if they are just dead inside people.