Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking pan with butter or cooking spray. You can also line the pan with parchment paper to make it easier to remove the cake later.

In a large mixing bowl, whisk together the flour, sugar, baking soda, cinnamon, cloves, nutmeg, and salt. Make sure all the ingredients are well combined.

In a separate bowl, whisk together the vegetable oil, molasses, and eggs. Gradually add the hot water, whisking continuously, until everything is well combined.

Add the wet ingredients to the dry ingredients, and mix until everything is well combined. Fold in the raisins and chopped walnuts until they are evenly distributed throughout the batter.

Pour the batter into the prepared pan and smooth out the top with a spatula. Bake the cake in the preheated oven for 35-40 minutes, or until a toothpick inserted in the center comes out clean.

Remove the cake from the oven and let it cool completely in the pan. Once the cake is cool, you can remove it from the pan and slice it into individual servings.