What is a knish? Homemade knish recipe so you can make your own knish at home. This is a requested recipe from one of our viewers but after seeing the knish made I am tempted to make some because they look and sound pretty tasty. Daniel Delaney has a video that gives us the history of knish and then shows us how to make them. I think I would like the potato filling but some of the other fillings mentioned sounded good as well. Looks like you could make the filling be what ever you would like.