Preheat oven to 350 degrees Fahrenheit.
In a medium sized mixing bowl whisk together the flour, baking soda, salt, ginger, cinnamon and nutmeg. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment combine the butter and brown sugar. Beat until well combined.
Add the egg and beat until well combined and then mix in the orange zest and the molasses.
With the mixer set to low speed, slowly add in the flour mixture. Beat until just well combined.
For each cookie, drop one tablespoon of dough onto the parchment lined cookie sheet, leaving at least one inch between cookies.
Sprinkle each cookie with a bit of demerara sugar if desired.
Bake in the middle rack of your oven for 10 minutes.
Remove from oven and allow to cook for 5 minutes before transferring to a cookie rack to cool completely.