Combine all the dry ingredients in a large bowl and mix well. Take the bittersweet chocolate and roughly chop it up to give a chunky but consistent size. Mix well with a wooden spoon and then store in a dry airtight container. To make the hot chocolate, simply add 1 cup of water per 1/2 cup of hot cocoa mix. Heat in a small saucepan over low heat, stirring with a whisk. Heat until hot, but do not boil, about 6 to 7 minutes. Serve with marshmallows.
In a medium sized saucepan soak the gelatin in the cold water. After the gelatin has softened, approximately 10 minutes, add the regular sugar and then gently dissolve over low heat, approximately 8 minutes. Remove from the heat and allow to cool to room temperature.
In a mixer, beat the egg whites until stiff peaks and then fold in the sifted confectioners' sugar. While the mixer is on low, slowly pour in the cooled gelatin mixture. Increase the speed and beat until white and thick. The volume should double in size and should form between soft and firm peaks.
Line an 8 by 8-inch baking dish with high sides with foil, grease slightly with butter, and coat with confectioners' sugar. Alternatively, you can use a baking sheet, but the marshmallows will not be as tall. Pour marshmallow mixture in and top with more sifted confectioners' sugar. Leave out overnight or for at least 3 hours to set. The marshmallow should be light and spongy when set.
Loosen marshmallow from edges of tray and invert onto a large cutting board. Peel off foil and use a large knife to cut the marshmallows into cubes. Dredge each piece in confectioners' sugar.
* We retested this recipe. It works best with 3 tablespoons gelatin.
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