Heat oven to 375 . Combine parsley and chives in small bowl. Unroll 1 package of rolls onto lightly floured surface. Do not separate dough along perforations. Overlap the 2 dough rectangles about inch along long sides. Pat dough on overlap and perforations to form smooth rectangle about 13" by 7". Sprinkle with 2 tablespoons cheese and the parsley mixture. Roll up, jelly-roll fashion, from short side. Pinch edge to seal. With a sharp knife, cut into 12 equal slices. Repeat with second package. Overlap slices on foil lined cookie sheet to form a 9" ring. Beat egg yolk and water. Brush over the ring. Sprinkle ring with sesame seeds. Bake 20 minutes or until golden. Serve with butter if desired.