A s'more is a campfire treat made of a roasted marshmallow and a piece of chocolate sandwiched between two graham crackers; the marshmallow's heat softens the chocolate as it's eaten by hand. The name is a contraction of "some more," reflecting how often people ask for another. The earliest known published recipe appeared in the Girl Scouts' 1927 book Tramping and Trailing with Girl Scouts, though similar campfire treats may predate it. To make one, a marshmallow is toasted over an open flame on a stick or roasting fork until golden and gooey, then sandwiched between the crackers with the chocolate. It's closely tied to American camping and cookout culture. Common variations swap in different chocolates (dark, milk, or peanut butter cups), use other cookies or biscuits in place of graham crackers, or add peanut butter, caramel, or fruit.