Preheat the oven to 350°F.
In a large bowl, cream the butter and sugar until light and fluffy.
Mix in the egg.
Mix in the molasses and water. It won't fully mix into a homogenous mixture, but that's okay.
In a separate medium bowl, combine flour, spices and baking soda.
Mix the flour mixture into the butter mixture, until just combined.
Scoop the cookies in 2 tbsp (25 g) balls and roll in sugar. If the cookies aren't holding their shape, chill in the fridge until firm, then scoop and roll.
Transfer cookies to the baking sheet, leaving at least 2 inches (5cm) between each cookie.
Bake the cookies for 10 minutes, until the tops look dry rather than wet and shiny. They won't be browned much when fully baked. Cool on the baking rack for a couple minutes, then transfer to a cooling rack and cool fully.