National Marshmallow Day is unofficially observed in Australia, primarily in Melbourne, every May 18. This day celebrates the sweet confectionery known as marshmallows, which are made from sugar, corn syrup, water, and gelatin, resulting in a fluffy texture composed of 50% air. The origins of marshmallows trace back to 19th century France, where they were initially crafted from marsh-mallow roots. Over time, the recipe evolved, particularly with the advent of the starch mogul machine in the late 19th century, which allowed for mass production and the substitution of mallow root with gelatin. On this day, people indulge in various treats featuring marshmallows, such as roasted marshmallows, s’mores, and fluffernutters. These confections are enjoyed not only in Australia but also have gained popularity in other countries, including the United States and Canada.