1Place the raisins, lemon rind, and whiskey in a small bowl and let them soak overnight. Line bottom of an eight-inch square cake pan with parchment paper that is buttered and dusted with flour. Preheat the oven to 350 degrees F (175 degrees C). Sift the flour, salt, cloves and baking powder into a bowl and set aside.
2In a large bowl, cream butter and sugar together until light and fluffy. Add the egg yolks and beat well. Quickly beat in the flour mixture. Stir in the soaked raisins.
3In a separate clean bowl, whip the egg whites until stiff and fold them into the mixture. Pour this into your prepared pan and bake at 350 degrees F (175 degrees C) for 45 to 60 minutes, or until a toothpick inserted into the center of the cake comes out clean. Cool the cake thoroughly on a wire rack.
4To make the glaze: Mix the lemon juice with the sifted powdered sugar and just enough whiskey and warm water so that you can drizzle icing over the cake.