There are so many systems out there collecting data on your purchase history.

But how does it track a purchase you would have made, but the item wasn't there to purchase?

Huh?

Hang on; the thought is, how do you know if you were missing something off your menu? How do you figure out that the guest might give you an extra visit if you offered something different?

Well, you could hook up every guest to a mind-reading machine, or part of your sales funnel can be to ask a simple question.

If you could add a dish to our menu, what would it be?

It is amazing what you might learn if you ask.