Preheat oven to 350℉
In a large bowl, combine the shortening, sugar, molasses, baking soda and egg. Beat on medium speed for 2 minutes.
In a separate bowl, sift the flour, cloves, ginger, cinnamon and salt.
Add flour spice mixture into the shortening mixture and mix together on low speed until dry and wet ingredients are fully combined.
Stir in 1 Tbsp. spiced rum and mix to incorporate. (optional)
Cover dough and place in refrigerator for 30 minutes.
Roll approximately 1 Tablespoon of dough into balls and then roll them in sugar and place them on a parchment lined baking sheet about 2 inches apart.
Bake in 350° oven for 10 minutes. They will seem gooey and undercooked, but they will finish cooking as they cool.
Immediately sprinkle with several flakes of Maldon Salt per cookie as soon as they come out of the oven. Let them cool on the baking sheet for 2 minutes and then transfer to a cooling rack or platter.
Enjoy!