NEW YORK (CBSNewYork) – Did you know cheesecakes date way back – all the way to 770 B.C.?

Monday marks an unofficial national holiday: National Cheesecake Day.

More: NYC’s 7 Best Slices Of Cheesecake

Anthropologists believe the first cheesecake was made in Greece – but we’re sure the Greeks had nothing on the recipe for Junior’s Cheesecake.

Alan Rosen, co-owner of the New York institution, visited the Couch to celebrate the day – and give us the secret to making a great version of the dessert.