This food holiday on March 18 each year celebrates a hot sandwich usually made with ground beef, onions, and tomato sauce on a hamburger bun or roll. Brown sugar or maple syrup are sometimes added to sweeten the mix; seasonings may be used to spice it up. Also known as a manwich, sludge burger, spoon burger or tavern sandwich, the sloppy Joe originated in the United States during the early 20th century.