Preheat oven 325 degrees F. Grease and lightly flour a bundt pan.
In a medium bowl, whisk together 3 cups all-purpose flour, ½ cup cocoa powder, 1 teaspoon baking soda, and ¼ teaspoon salt. Set aside.
Using an electric mixer, cream together the 1 ½ cups butter and 3 cups granulated sugar until light and fluffy.
Add in 8 ounces sour cream.
Alternate adding the flour mixture and the 5 large eggs. Add a little flour mixture, mix, then add in an egg, and mix. Do this until all is combined. At this point, the batter will be very thick.
Carefully add 1 cup of hot water. The mixture may splash out, so at this point, I use a whisk. The cake batter will be thin, this is normal. Whisk the mixture until smooth.
Stir in 2 teaspoons vanilla extract.
Pour into prepared bundt pan and bake at 325 degrees F. for 1 hour to 1 hour and 20 minutes, or until done and a cake tester comes out clean.
Carefully remove the cake from the oven and allow to cool in the pan on a wire rack for 20 minutes before removing. At this point, you can slice and enjoy as is, add the frosting of your choice, or chocolate ganache.
For a quick and easy chocolate ganache. Bring ½ cup of heavy cream to a low boil and pour over 4 ounces of good quality dark chocolate, chopped or broken into ½-inch pieces. Wait 1 minute and stir until smooth and glossy.
Drizzle chocolate ganache onto the cake while it is still warm. Slice and serve. Store at room temperature in an airtight container up to for 5 days
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Notes
Try to use room temperature ingredients for easier mixing and a smooth batter that will help you to have a light, tender, and fluffy cake.
After adding the cake batter to the cake pan, lightly tap the bottom of the pan on the kitchen counter to remove any air bubbles.
While mixing be sure to scrape the side of the bowl to make sure the cake is fully combined.
Take your time preparing the cake pan to prevent your cake from sticking to the pan. Use shortening and lightly flour before adding the cake batter or use baking spray.