What are the 5 kosher foods?

There is no single list of kosher foods as creating such a list would be impossible. Kosher isn't a style of food, it is a title given to any food that is prepared following the laws of kashrut (Jewish dietary laws).

For example, macaroni and cheese can be kosher if it is made in a kosher kitchen using kosher ingredients. The same is true for chow mein, which is Chinese in origin, but again, can be made with kosher ingredients.