The Burger Cupcakes were originally called "WOAP "Burger"": invented for Visa Wellington On a Plate's annual event, Burger Wellington.
Salted caramel cake "buns" with sesame seeds, dark mud cake "patty" with fondant "cheese", piped with vanilla bean buttercream "lettuce" and "tomato".
Note: these can be made anytime and don't require special ingredients, so unlike the other rare flavoured cupcakes there's no need to check in first to see if they are able to be made.