Start by preheating your oven to 350 degrees F.
Spray a non-stick bundt cake with cooking spray then dust with cocoa powder and flour (about 1/2 tsp of each), make sure to shake out excess.
Next, mix flour, sugar, baking soda, and salt in a medium bowl. Set aside.
Now, mix melted butter, hot water, and cocoa powder in a large mixing bowl.
With an electric hand mixer, combine flour mixture and butter mixture until well combined.
Add the sour cream, eggs, and vanilla extract, mix until well combined.
Once ready, pour the mixture into the prepared bundt pan.
Bake for about 40 to 50 minutes, until a toothpick inserted into the center, comes out clean.
Let the cake cool for 8 to 10 minutes, then run a knife along the sides of the cake to ensure it is loose. Invert the cake onto a wire rack to cool for 30 minutes.
To make the chocolate ganache, place the chocolate in a medium heatproof mixing bowl.
In a small saucepan on the stove, heat heavy cream until simmering. Pour the hot cream over chocolate (submerge chocolate if necessary).
Let the mixture rest for 4 minutes, then stir until melted and smooth.
Pour chocolate mixture over your Ina Garten Chocolate Bundt Cake and allow it to cool slightly, then slice into slices and serve immediately.