A marshmallows is a ...

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A marshmallows is a confection made from sugar, cornstarch, corn syrup and gelatin. It is spongy and usually white or pastel colors.
The use of marshmallow to make a sweet dates back to ancient Egypt, where the recipe called for extracting sap from the plant and mixing it with nuts and honey.
Marshmallows often are baked atop sweet potatoes and used in a puffed cereal bars, candy, desserts, eaten plain or toasted or used in s’mores.
A s'more (sometimes spelled smore) is a traditional nighttime campfire treat popular in the United States and Canada and consisting of a roasted marshmallow and a layer of chocolate sandwiched between two pieces of graham cracker.