Derry's Sooty Olive posted a note received from two diners who said they "suffered through eight weeks of horrendously disfigured steak" before landing in the Waterside eatery.
"Your postscript recommendation of not ruining a steak by overcooking it, gave us hope," they wrote.
"Everything was spot on.
"Thanks for the best meal we've had in Europe."
An amazing little msg left behind by some customers this evening #chuffed pic.twitter.com/RGB1ohjJmK
— Thesootyolive (@thesootyolive) 1 августа 2016 г.