Martha Stewart's Homemade Marshmallows

Description
Created by Martha Stewart

Ingredients

 * 2½ tablespoons unflavored gelatin
 * 1½ cup granulated sugar
 * 1 cup light corn syrup
 * ¼ teaspoon salt
 * 2 tablespoons pure vanilla extract
 * confectioners' sugar (for dusting)

Directions

 * 1) Combine gelatin and ½ cup cold water in the bowl of an electric mixer with whisk attachment.
 * 2) Let it stand 30 minutes.
 * 3) Combine granulated sugar, corn syrup, salt and ½ cup of water in a small heavy saucepan; place over low heat and stir until sugar has dissolved.
 * 4) Wash down sides of pan with a wet pastry brush to dissolve sugar crystals.
 * 5) Clip on a candy thermometer; raise heat to high.
 * 6) Cook syrup without stirring until it reaches 244°F (firm-ball stage).
 * 7) Immediately remove pan from heat.
 * 8) With mixer on low speed, slowly and carefully pour syrup into the softened gelatin.
 * 9) Increase speed to high; beat until mixture is very thick and white and has almost tripled in volume, about 15 minutes.
 * 10) Add vanilla; beat to incorporate.
 * 11) Generously dust an 8 x 12-inch glass baking pan with confectioners' sugar.
 * 12) Pour marshmallow mixture into pan.
 * 13) Dust with confectioners' sugar; let stand overnight, uncovered, to dry out.