Divide dough into 8 equal pieces. Roll each into a ball, and place on greased baking sheets; press down lightly with fingertips to resemble a bun. Cover and let rise in a warm place (85 degrees), free from drafts, about 30 minutes or until doubled in bulk. Combine egg white and water, beating until frothy; brush over buns. Sprinkle buns with sesame seeds. Bake at 200ºC or 15 to 20 minutes or ----