Preheat oven to 350°F. Grease and flour an 8-inch or 9-inch square baking pan, spray with nonstick baking spray, or line with parchment paper; set aside.
In a large mixing bowl, sift together the flour, baking soda, ginger, cinnamon, cloves, nutmeg, and salt.
In a separate bowl, whisk together the egg, oil, sugar, and molasses.
Add the egg mixture to the dry ingredients; stir just until combined. Do not over-mix.
Pour boiling water over the top of the mixture; stir until smooth.
Transfer the batter to the prepared pan.
Bake for 22-28 minutes, until a toothpick inserted in the center comes out clean. Be careful not to overbake the cake or it will become dry.
Cool on a wire rack before slicing. Dust with powdered sugar, top with a dollop of whipped cream, or drizzle warm lemon sauce over top.