Move aside hourglass, there's a new marshmallow in town. Lucky Charms has unveiled its first new marshmallow in 10 years - the magical unicorn! Earlier this month, General Mills announced it was retiring the hourglass marshmallow. Lucky Charms then asked social media users to vote on which marshmallow they would like to see next - by answering with an emoji... And, sure enough, the newest marshmallow is also an emoji - the unicorn.