The primary ingredient in a traditional s'more is marshmallows. S'mores are a popular campfire treat consisting of roasted marshmallows sandwiched between two graham crackers and a piece of chocolate. The combination of the gooey, warm marshmallow and the rich, melty chocolate creates a delightful contrast in textures and flavors. The treat's name is a contraction of "some more," reflecting the desire for additional servings. First popularized in the early 20th century, s'mores have become a staple of camping experiences in North America, often associated with outdoor family gatherings and bonfires.