Fold the tip of every other corner to the center of each square. Fold the squares into triangles by folding the left hand corner to the right hand corner, sealing the egg washed edges. Lift onto a sheet pan with a spatula. Egg wash, let rest. Bake at 415 degrees till done, about 15 minutes.
Egg wash the long edges.
Pipe a thin line of raspberry jam down the center line. Ignoring the jam line, do a three fold turn over the jam. Cut into 2 inch slices. Put the right corner through the hole and turn the pastry inside out. Pan up, egg wash, sprinkle with coarse sugar.