If I owned a restuarant
Each table would have a log (could be notebook paper) that records every customer’s order. And I would never edit it.
When the customer asked me for my recommendation, I would point to the log and say, “check what the person before you ordered.”
After every meal, each person would fill out their name, the date, what they ordered, drink…etc. If they so desire, I’d let them get creative and supply pens, crayons, and colored pencils.
The log would grow to several sheets of paper- I’d keep every page.
And the few customers who resist the log? That’s fine, I’m ok if they don’t want to come back.