Add the syrup with the gelatin into the whipped egg whites while whipping in low speed. When all has been added, turn the speed up to high and let it whip until ribbons start to form. Add the flavoring and food coloring at this point. We don't want the marshmallow to cool completely because we want to be able to spread it. Remove from mixer and pour into the square frame that has been placed over a silicon mat. Let it harden.
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