QR-code feedback at the table — now, not later
If a guest is supposed to think about your rating on the way home, the battle is mostly lost. Three days later nobody remembers the exact sauce or the service at table six. A QR code on the table stand or the receipt flips that: the guest scans right after the meal, gives three stars and a sentence of comment, done in twenty seconds.
The form has to be short — one NPS question, optional free text field, no mandatory email. The "enter email" hurdle drops the response rate drastically without giving you anything in return. Anyone voluntarily leaving an email for the newsletter does so as a bonus, but it is not required.
The table stand itself can carry a different QR code per table, so you know whether table 3 by the window or table 12 in the corner gets the better ratings. Hidden fields in the URL parameter handle that without any action from the guest — they just scan, the form knows where the scan came from.