Ham schnitzel was a ham dish from Germany, on Earth. In this dish, the ham was lightly coated with bread crumbs and fried.
In the 2250s, a menu of Earth foods in the mess hall aboard the USS Discovery listed a ham schnitzel and side soup. This food item was packaged in a big lunch pack, which was available from 11:00 to 17:00 hours. (DIS: "Despite Yourself")