Preheat the oven to 220C/450F and line a baking tray with baking paper.
Roll the rough puff out into a large 14x10 inch rectangle, trim the edges and cut into 6 squares.
Fold the corners of each square into the middle, and press down in the centre, forming a smaller square, which kind of looks like an envelope.
Place a dollop of about 2 tsp of jam onto each danish. Brush the edges with egg wash and bake for 20 minutes, or until dark golden brown and crisp.
Let cool completely.
If desired, mix the icing sugar with about 1 tbsp water to produce a thick, stiff white icing. Transfer to a small disposable piping bag, cut off the tip, and pipe decorations onto the Danishes. Enjoy!
Recipe by The Sugar Hit at http://www.thesugarhit.com/2016/04/double-time-cherry-danish.html