Preheat oven to 375°F (190°C). Grease a baking sheet.
In a large bowl, cream together the butter and brown sugar until light and fluffy. Beat in the molasses until combined.
In a small bowl, whisk together the baking soda, ginger, cinnamon, allspice, cloves, and salt. Stir into the butter mixture until combined.
Gradually stir in the flour until a soft dough forms. Roll the dough into 1-inch (2.5 cm) balls and place on the prepared baking sheet. Bake for 8-10 minutes, or until the cookies are lightly golden.
In a small bowl, stir together the confectioners' sugar, vanilla, and enough water to make a spreadable icing. Spread the icing onto the cooled cookies.
Interesting Facts
Moravian ginger cookies were originally created by the Moravian settlers in Pennsylvania in the mid-1700s.
The cookies were traditionally made with lard instead of butter.
The Moravian settlers were known for their gingerbread-like cookies, which were a popular treat for special occasions.