Make sure your hot fudge is chilled so it's easy to work with.
In a mixing bowl, combine flour, cocoa powder, salt, and baking soda, and set aside.
In your mixer, cream together 1 cup of white sugar, the brown sugar, and shortening, until fluffy.
Add the eggs, vanilla, and water, and beat until the mixture is smooth.
Ass the flour/cocoa mix and beat to combine well.
Divide the dough into 24 equal pieces, roll into balls, and chill in the fridge for about 10 minutes.
Preheat your oven to 350°F.
Flatten each dough ball into a thick disk. Add about 1 teaspoon of hot fudge to the center of each.
Carefully wrap the dough around the fudge, lightly pinch to seal, and re-roll into a ball.
Roll each dough ball in the remaining white sugar to coat the outside.
Place on cookie sheets lined with silicone baking mats (or parchment paper), spaced at least three inches apart to allow for spreading as they bake.
Bake for 6-8 minutes, until the cookies are just starting to crack on top.
Let cool for a couple of minutes, then transfer to a cooling rack to finish cooling, or simply enjoy as they are.