How to Make Marshmallows

Combine the granulated sugar, corn syrup, and 3/4 cup water in a large pot over medium heat.Stir until the sugar is completely dissolved, then stop stirring and allow the mixture to come to a boil. Insert a candy thermometer. Continue boiling until mixture reaches 260 degrees (hard-ball stage) on the thermometer. This process will take awhile, so move on to the next two steps while the sugar syrup cooks, but be sure to check the sugar syrup frequently so that it does not go above 260 degrees.