Preheat oven to 180C/350F/Gas 4 and line a muffin pan with 12 regular-sized cupcake liners.
Combine sugar, oil, water, eggs, and pumpkin in a large mixing bowl and beat on low for 1 minute. Do not over mix.
Add flour, baking soda, salt, cinnamon, nutmeg, cloves, and ginger to a small bowl and stir to combine.
Add dry mixture to pumpkin batter and beat on low just until all ingredients are moist.
Fill cupcake liners with batter until they are three-quarters full.
Bake for 12-15 minutes, then remove from oven and sprinkle each muffin with coarse decorating sugar and return to oven to finish baking another 13-15 minutes, or until a toothpick inserted in the center comes out clean. (Total cooking time should be 25-30 minutes).
Remove from oven and leave to cool in the pan for 5 minutes before transferring to a wire rack to cool completely.
Notes
Make sure you choose 100% pure pumpkin vs. pumpkin pie filling for this recipe because you are already adding sugar and spices to this recipe.