According to foodtimeline.org, the marshmallow actually started as a herb "Althaea officinalis" which, during ancient times, grew throughout Europe and Asia. Known as one of the earliest
confections in human history, ancient Greeks and Romans viewed the plant as a source of health. According to foodtimeline.org, "The first marshmallows were made by boiling pieces of the marsh mallow root pulp with sugar until it thickened. After is had thickened, the mixture was strained and cooled. As far back as 2000BC, Egyptians combined the marsh mallow root with honey. The candy was reserved for gods and royalty."Today's marshmallow did not take form until 1850. It was at that time that French confectioners began producing the customary white square marshmallow. The process was "slow and expensive" because each marshmallow had to be molded and cast. French confectioners used minimal ingredients including mallow root extract, egg white, corn syrup, and water. Being that marshmallow production was a tedious process, they were only made in speciality shops, and thus remained a luxury sweet for the wealthy.
It was not until 1900 that the marshmallow became a mass produced item available as "penny candy" for children. The mass-produced marshmallow flourished and by 1955 there were over 30
marshmallow producers in the United States alone. Today, there are only three remaining marshmallow producers in the United States. Production time including mixing, cooking, cooling, and bagging is 60 minutes.Overtime, the use of the marsh root was replaced by gelatin. This transition, from marsh root to gelatin, has made the marshmallow a non-vegan option. Marshmallows are now animal based products and have nothing to do with the marsh root of which they originated. A sign of the times, today's marshmallow exchanges the natural spongy consistency of the marsh root with gelatin, and the sweetness of sugar has been replaced by corn syrup.
Marshmallows have become a staple in candy, campfires, fruit salads, and sweet potato casseroles that are found on most U.S. Thanksgiving tables. According the foodtimeline.org, the advancement of marshmallow in the American diet occurred simultaneously as jello during the 1920's - 1930's. This phenomenon was due in part to the production of recipes that favored the combination of jello and marshmallow-like the infamous jello mold.
One of the most iconic marshmallow based food items is the S'more. According to Wikipedia, the invention of the S'more is unclear, but the earliest recorded recipe can be found in a 1927 Girlscouts' cookbook. The title of S'more is thought to be from the the phrase "some more" but has been condensed to S'more. The S'more has become a cultural campfire staple in the U.S., Canada, the U.K., Australia, and New Zealand. It is a simple recipe of two graham cracker halves, a couple pieces of chocolate, and a freshly roasted marshmallow. According to Wikipedia, the S'more is currently evolving to include Belgian S'more which incorporates licorice and the Pop Tart S'more that replaces the graham cracker with Pop Tart pastry snacks.
The marshmallow, like most of today's highly processed foods, which only holds the name of which it began. The marsh root is non-existent, sugar is now corn, specialty confection has become mass commodity ready to ship in 60 minutes. From royalty, to speciality for the wealthy, to its place to the middle-class campfire, this small spongy square is a reflection of technology and changing lifestyles. It has moved from slow food to fast food. From speciality to commodity.
by Alton Brown courtesy of the food network

Place the gelatin into the bowl of a stand mixer along with 1/2 cup of the water. Have the whisk attachment standing by.
In a small saucepan combine the remaining 1/2 cup water, granulated sugar, corn syrup and salt. Place over medium high heat, cover and allow to cook for 3 to 4 minutes. Uncover, clip a candy thermometer onto the side of the pan and continue to cook until the mixture reaches 240 degrees F, approximately 7 to 8 minutes. Once the mixture reaches this temperature, immediately remove from the heat.
Turn the mixer on low speed and, while running, slowly pour the sugar syrup down the side of the bowl into the gelatin mixture. Once you have added all of the syrup, increase the speed to high. Continue to whip until the mixture becomes very thick and is lukewarm, approximately 12 to 15 minutes. Add the vanilla during the last minute of whipping. While the mixture is whipping prepare the pans as follows.
For regular marshmallows:
Combine the confectioners' sugar and cornstarch in a small bowl. Lightly spray a 13 by 9-inch metal baking pan with nonstick cooking spray. Add the sugar and cornstarch mixture and move around to completely coat the bottom and sides of the pan. Return the remaining mixture to the bowl for later use.
When ready, pour the mixture into the prepared pan, using a lightly oiled spatula for spreading evenly into the pan. Dust the top with enough of the remaining sugar and cornstarch mixture to lightly cover. Reserve the rest for later. Allow the marshmallows to sit uncovered for at least 4 hours and up to overnight.
Turn the marshmallows out onto a cutting board and cut into 1-inch squares using a pizza wheel dusted with the confectioners' sugar mixture. Once cut, lightly dust all sides of each marshmallow with the remaining mixture, using additional if necessary. Store in an airtight container for up to 3 weeks.
For miniature marshmallows:
Combine the confectioners' sugar and cornstarch in a small bowl. Line 4 half sheet pans with parchment paper, spray the paper with nonstick cooking spray and dust with the confectioners' sugar mixture.
Scoop the mixture into a piping bag fitted with a 1/2-inch round piping tip. Pipe the mixture onto the prepared sheet pans lengthwise, leaving about 1-inch between each strip. Sprinkle the tops with enough of the remaining cornstarch and sugar mixture to lightly cover. Let the strips set for 4 hours or up to overnight.
Cut into 1/2 inch pieces using a pizza wheel or scissors dusted with the confectioners' sugar mixture. Once cut, lightly dust all sides of each marshmallow with the remaining sugar mixture and store in an airtight container for up to a week.
