Divide the dough into two equal parts. Roll each part over a clean work surface dusted with flour into a 19x13-inch rectangle.
Spread half of the chocolate filling over the dough, leaving a one-inch border around the edges.
Gently lift the wider side of the rectangle and fold it in half.
Gently roll the rectangle into a 19x8 rectangle.
Using a sharp knife or a pizza wheel, mark the dough every two inches along both wide sides.
Cut the dough diagonally from the first mark closest to you, moving toward the opposite corner and back in a straight line.
Gently roll each triangle from the wide end toward the tip, stretching the dough with your opposite thumb.
Place the pastries over a baking pan lined with parchment paper.
Brush the pastries with an egg wash and place in a warm spot to rise for 60-90 minutes.
As the pastries rest, make the simple syrup by bringing the water and sugar to a boil, then reduce to a simmer and cook for five minutes.
Bake for 20-25 minutes, at 350F (180C) preheated oven, or until a thermometer reads 180F from the center of the pastries.
Remove from the oven and brush with the simple syrup.