One large marshmallow weighs an average of 7 grams, which is equivalent to the weight of about 10 miniature marshmallows. When cooking with marshmallows, one large marshmallow is equivalent to one-tenth of a cup of miniature marshmallows.
Marshmallows are a confection made from corn syrup, gelatin and eggs. Marshmallows were first produced in France in the mid-19th century and were originally made from a mixture of sugar, eggs and the gummy root of the marshmallow plant, a medicinal herb known for centuries for its anti-inflammatory properties. Eventually, gelatin was substituted for marshmallow root in the recipe. This innovation is responsible for creating the soft, springy texture that is characteristic of modern marshmallows.