Marshmallow creme, one of the two main ingredients of a Fluffernutter, was invented in the early 20th century. Archibald Query invented a creation he called Marshmallow Creme in Somerville, Massachusetts, in 1917, while Amory and Emma Curtis of Melrose, Massachusetts, invented Snowflake Marshmallow Creme in 1913. During World War I, Emma Curtis published a recipe for the "Liberty Sandwich", which consisted of peanut butter and Snowflake Marshmallow Creme on oat or barley bread. The recipe was published in a promotional booklet sent to Curtis' customers in 1918 and may be the origin of the Fluffernutter sandwich. Earlier labels and booklets published by the Curtises suggested combining Snow Flake Marshmallow Creme with peanut butter or eating it on sandwiches with chopped nuts or olives.