Ingredients

  • 3 cups sugar
  • 1 14 cups light corn syrup
  • 14 teaspoon salt
  • 1 12 cups water
  • 3 tablespoons unflavored gelatin, plus
  • 4 (1/4 ounce) envelopes unflavored gelatin
  • 2 teaspoons vanilla extract
  • 1 12 cups powdered sugar

Method

  • Line a 9x13 pan with parchment paper.
  • Bring sugar, corn syrup, salt, and 3/4 cup water to a boil.
  • Cook without stirring until it registers 238 on a candy thermometer (about 9 minutes).
  • Put remaining 3/4 cup water into a mixing bowl.
  • Sprinkle evenly with gelatin and let soften for 5 minutes.
  • With mixer on low speed beat hot syrup into gelatin mixture.
  • Gradually increase speed to high and beat until very stiff (about 12 minutes).
  • Beat in vanilla.
  • Pour into prepared pan and smooth with an offset spatula.
  • Let stand uncovered until firm (about 3 hours).
  • Sift 1 cup of powdered sugar onto a work surface.
  • Unmold marshmallow on top and remove parchment paper.
  • Lightly brush a knife with oil, cut marshmallows into squares.
  • Roll each marshmallow in remaining powdered sugar to coat.
  • Store in an airtight container.