Now this is a hybrid food we can get behind: Shake Shack is about to debut a “Cronut hole concrete” for one day only at its Madison Square Garden location on Tuesday, September 17th. The blended butter caramel frozen custard is blended with three cinnamon sugar Cronut holes, and has a bonus Cronut hole on top. “One of the most frequently asked questions I get these days is what line I’ve waited in, and I always answer it’s the one at Shake Shack in Madison Square Park,” Chef Dominique Ansel says in an official Shake Shack press release.

The Cronut Hole Concrete will sell for $4.50, and there’s a limit of two per person. There will only be 1,000 special concretes available starting at 10:00am, so we figure you should start lining up at least one week before. Bring a few magic soufflés and frozen s’mores to eat while you wait in line.