Chocolate-Glazed Bismarcks with Marshmallow Cream

A Bismarck is nothing more than a jelly donut. Presumably it got its moniker in the late nineteenth century, when the German chancellor Otto von Bismarck was a household name and jelly donuts were still associated with German immigrants. I suppose you could also call these Boston creams, even if the filling isn’t the traditional custard, which of course you could use instead of the marshmallow filling. For filling them, you ideally want a piping bag fitted with a Bismarck tip (it looks like