Chocolate Walnut Marzipan Squares

"Chocolate Walnut Marzipan Squares: a unique take on an old favorite. Authentically, marzipan is made with almonds. But I only eat fresh, almonds in one piece. Back in the day there was this glue called Karbofix. We used it for arts and crafts in school. It came in a tall, round box not unlike a box for face cream. When you opened it, there was a tidy blob of white glue, and a small place for a spoon used to scoop out the glue and smear it on paper. The glue smelled like almonds. "