Using pam cooking spray, spray a 9x9 baking dish and set aside.
In the bowl of a standing mixer, combine the 4 tbsp of gelatin and cold water.
Allow to sit while you boil the sugar.
In a medium pot, stir together the sugar, corn syrup, water, and salt over high heat.
Once the mixture starts to boil, insert candy thermometer and stir occasionally until the mixture reaches 240 degrees.
Turn the mixer on low speed and slowly pour in the hot mixture.
Increase the speed to medium and beat for 7-9 minutes until the mixture is white and fluffy.
Beat in the vanilla.
Split the marshmallow into two bowls.
Mix in a few drops of pink food coloring into one bowl.
Pour about 1 1/2 C of white marshmallow into the pan allow to sit for 2 minutes.
Pour 1 1/2 C of pink marshmallow onto the top of the white.
Repeat steps with remaining marshmallows.
Allow to dry overnight.
Sprinkle a cutting board with powdered sugar.
Flip over the marshmallow onto the cutting board and sprinkle more powdered sugar onto the bottom and sides.
Cut the marshmallows into 2 inch squares and enjoy!