Preheat oven to 180ºC . Into a medium bowl, sift together flour, ginger, baking soda, cinnamon, cloves, and salt. In a large bowl with electric mixer, beat Prune Butter and sugar until well-blended. Beat in egg and molasses until well-blended. Stir in flour mixture until completely mixed. Place a little sugar in a medium bowl. Scoop out heaping teaspoonfuls of mixture. Using your palms, roll into 2 cm balls and drop into the sugar. Roll to cover the surface completely; then place balls 5 cm apart on ungreased baking sheets. Bake until cookies are slightly rounded and tops appear lightly browned and crackles. Remove baking sheets to wire racks to cool slightly. The, using a metal pancake turner or palette knife, remove cookies to wire racks to cool completely. Repeat with remaining cookie dough and sugar. Store in airtight containers. * Prune butter is from "Secrets of Fat Free Baking" by Sandra Woodruff. To make one cup, combine 8 oz prunes and 6 tb water or fruit juice in food processor. (I used apple juice for the batch for this recipe.)