In its latest bid to revive sales, McDonald’s is adding a new sirloin burger option to its US menu. The sirloin burger will be available in three versions and served on a wooden board to try signify freshness and high quality.McDonald’s will hope this premium burger option will allow the struggling fast food giant to better compete with upstart gourmet burger chains, such as Smashburgers, Shake Shack and Five Guys, that have eaten into sales in recent years.