December, 2015
Add the gelatin and a ½ cup of the water to a large bowl. In a small pot, combine the remaining ½ cup of water with the sugar, corn syrup and salt, and place over medium heat. Cover and let cook 3 to 4 minutes. Then uncover the pot, and clip a candy thermometer to it. When the temperature reaches 240˚F (7 to 8 minutes), remove the pot from the heat.
With your hand-mixer on low in the bowl with gelatin, slowly drizzle in the syrup mixture. Increase the speed to high, add vanilla and whip until light and fluffy (12 to 15 minutes).
Spread into a foiled and greased 9-by-13-inch pan, and let set until firm (3 hours). Remove the foil-lined marshmallow from the pan, and sift the top with icing sugar. Cut the block into desired shapes, roll the shapes in more icing sugar and dig in!