What? I hear you shout. I know, it took me a while to get my head round these little babies too but essentially they are a cross between a cupcake and a trifle.
They have been conjoured up by New York bakers www.beeskneesbakingco.com who originally made them as an alternative to cupcakes for weddings. Because they are served in whiskey glasses (or bourbon glasses if you are the other side of the pond) they can very easily be stacked to form a cake tower. Also the glasses can be ingraved with personalised wedding messages for guests as a memento of the day.