Marshmallows are soft, spongy confectionery puffs typically made from sugar, water, gelatine (or another gelling agent), and flavourings (often vanilla). The term “gum on” could refer to a specific brand name or style that highlights a chewier texture (sometimes achieved with gum arabic or added gums), but fundamentally it’s still a sweet marshmallow treat. They can be eaten as snacks, used in desserts, hot chocolate, s’mores, baking and more.