A glowing letter to the manager or head office customer service bods about said employee being awesome.
+1, my boss got something similar about me from an external contractor we’d hired to do some work and I’d spent a couple of months shadowing/minute taking for him. I got a bonus out of it.
On a side note, I also hate tipping, went to the Thai Square on the Strand in London, service was awfull, a good 10 minutes between me being served and my missus meal arriving and the staff were just generaly rude. Then they added the ‘tip’ onto the bill, then acted insulted when we didn’t top it up even further!
A letter addressed to that employee (if you know they’re name) through the store’s address. Bung a tenner inside, that way they have no option when it comes to accepting/ not accepting a ‘tip’ so they haven’t really done owt wrong. Plus that way it might slip under the eyes of management.
That’s getting a bit stalkerish and creepy. I’d be a bit uncomfortable if strangers started sending me cash in the post.