Preheat the oven to 375 degrees.

In a small bowl, whisk together the flour, salt, baking soda, and cinnamon. Set aside.

Using a mixer, cream the butter, minced ginger and sugar until fluffy. Add the egg and molasses, beating well to combine. Alternate between the flour and hot water, ending with the flour and beating well after each addition.

Use a hinged scoop or tablespoon to drop the batter onto parchment-lined baking sheets, leave some space as they will spread. Sprinkle each with a little coarse sugar and bake for about 10 minutes, or until the center is no longer wet looking. Cool completely on a wire rack.