Prepare the baking pan with baking spray and parchment paper. See Top Baking Tips for details. Add ¼ cup Irish whiskey into a small ramekin. Add the raisins. Microwave for 30 seconds. Set aside to cool.
When cool, strain the raisins, retaining the whiskey they soaked in. This will be added to the batter later.
Add the water and whiskey (from the raisins), plus the sugar, and butter to a large heavy pan.
Bring the mixture to a boil over medium heat. Remove from heat.
Add the cinnamon, nutmeg, and cloves to the hot wet ingredients.
Mix well. Return pot to heat and boil for additional four minutes. Cool completely. Preheat oven to 350 degrees.
When the liquid is cool, add the flour, baking soda, salt, raisin, and walnuts.
Fold the flour mixture, raisins, and nuts into the wet ingredients until a nice batter forms.
Pour batter into the prepared pan.
Bake for 30-35 minutes in a 350- degree oven. Remove when a toothpick comes out clean. Cool cake in pan.
When the cake is cooled, lift it out of the pan or cut and serve directly from the pan. Top with powdered sugar if desired.