Start by preheating your oven to 350°F (175°C). While it heats, generously grease your bundt pan with butter or shortening. Dust it lightly with flour to ensure the cake doesn’t stick. This step is crucial for that perfect cake release!

In a large mixing bowl, blend the melted butter and granulated sugar together. Then add sour cream, eggs (beaten lightly beforehand), and vanilla extract. Blend until the mixture is smooth and creamy. This is where the magic starts to happen!

In another bowl, whisk together the flour, unsweetened cocoa powder, baking soda, and salt. Breaking this down into two separate bowls helps ensure that your dry ingredients are evenly distributed before they meet the wet ones.

Now it’s time to combine the contents of both bowls. Gradually add the dry mixture into the wet ingredients, mixing gently to combine. This will ensure you don’t over mix, resulting in a denser cake than you want.

Slowly add the very hot water into your batter. Yes, you heard me right! This step gives the cake that wonderfully moist texture we all crave. Mix until everything is just combined; a few small lumps are okay.

Pour the batter into your prepared bundt pan. Bake for about 55-60 minutes, or until a toothpick inserted in the center comes out clean. Baking time may vary depending on your oven, so keep an eye on it, starting around the 50-minute mark.

Once the cake is done, allow it to cool in the pan for about 15 minutes. After that, carefully invert it onto a wire rack to cool completely. Patience is key here; letting it cool properly will keep it from crumbling when you slice.

While waiting for the cake to cool, you can make the ganache. Heat the heavy cream until it's just simmering, then pour it over the chopped chocolate in a bowl. Let it sit for a couple of minutes, then whisk until smooth. Drizzle this over your cooled cake!