To make the optional egg garnish (jidan), separate the egg. Lightly beat the white by gently cutting it with a spoon. Stir the yoke with a spoon until smooth. Heat a lightly oiled nonstick skillet over medium low heat. Pour each egg part into a thin layer, tilting the skillet and/or spreading with a spoon. Cook each side briefly until no visible liquid remains. (Do not brown the egg.) Slice into small diamond shape pieces or short thin strips.