Most American children are familiar with marshmallows. These fluffy, chewy treats are sold in bags in the supermarket, often for use in Rice Krispie treats and s'mores. Marshmallow Fluff is a spreadable marshmallow product, often found nestled on shelves beside the peanut butter used for lunchbox confections, adding a sweet, viscous layer to sandwiches and brownies. Around Easter, marshmallow Peeps, with their softer structure and crunchy sugar coating, appear in stores. In many homes around the country, marshmallow-covered sweet potatoes are a staple at the Thanksgiving table.