It's a lot like a gyro. Ever see the big vertical rotisserie with the meat getting sliced off? That's döner meat.
It's a Turkish food but it's actually most popular in Germany. Sliced rotisserie meat (usually beef, chicken, lamb or veal) gets sliced into pita bread with lettuce, tomato, onion. Then a garlicky tzatziki sauce with a turkish hot sauce.
The owners are a German husband and wife... They decided to come to the US to open a döner Cafe. They've been here for 12 years and have a son whose a dual citizen. Really put their heart and soul into everything, it's beyond admirable to me.
Unfortunately, with the current political climate with immigration... The odds of them being able to stay here after 2021 aren't favorable.