There are also more complex risks for certain type of ethnic delis to consider like Jewish Delis keeping up costly kosher standards - such as keeping kosher by using biblical precepts to ritually slaughter animals, not serving pork or shellfish, and carefully keeping a 2 sets of kitchenware to prepare dairy and meat dishes separately.
Another example is Halal standards. According to Islamic guidelines, halal food is safe and not harmfully prepared; it does not contain non-halal and najs (unclean) ingredients; and it is processed and manufactured using equipment that is not contaminated with things that are najs.