I would sell my soul for a Waffallonia waffle.
Maybe not, BUT they have made some of the best waffles I have ever had. The Antwerp ($5) is my go-to: a belgian waffle topped with an ice cream flavor of your choice and chocolate syrup. Simple yet magical. The soft ice cream melting over top of the warm, crunchy waffle is something dreams are made of (*cue Lizzie McGuire song*).
The wait can be brutally long, especially on nice days when everyone is out on Schenley Plaza. In my experience, they can take forever to fulfill an order, but hey, you can't rush perfection.