Chocolate Birthday Cake

I love baking. Some people can cook, but they don't bake. Baking takes more time and precise measuring. I love baking because you can do it when you wake up, in the middle of the afternoon, or at midnight. It fills the house with a smell that is pure happiness. I wanted to make something for my brother's birthday. I knew he wouldn't like Pinkalicous cupcakes, so I decided to ask him what he wanted. Anything...name it and I'll make it. He said chocolate cake. Done. Now begins the search for the perfect recipe! I searched out a few and then decided to go with one of my favorites, Joy the Baker. And how could I go wrong when she calls it "The Best Chocolate Bundt Cake Ever". Yes, I knew this would be smashing. This is the best chocolate cake I have ever had. And I'm very proud that I baked it! For the cake: 1-1/4 cups plus 1 tablespoon brewed coffee 3/4 cup cocoa powder (I used Hershey's) 2-1/4 cup sugar 1-1/4 teaspoons kosher salt 2-1/2 teaspoons baking soda 2 whole eggs 1 egg yolk 1-1/4 cups plus 1 tablespoon buttermilk 1 cup plus 2 tablespoon vegetable oil 1-1/2 teaspoons vanilla extract 2-1/2 cups, plus 2 tablespoons all purpose flour, sifted For the glaze: 6 oz. unsweetened chocolate 3/4 cup unsalted butter 3 cups powdered sugar 1/2 cup sour cream, at room temperature 1/4 cup brewed coffee, cooled (plus more if needed) Place an oven rack in the center of the oven and preheat to 350 degrees. Grease and flour a 10-inch Bundt pan and set aside. To make the cake batter: Put brewed coffee and cocoa powder in a small saucepan and bring to a boil, whisking frequently. Remove from the heat and let come to room temperature (I let mine sit for almost an hour). In the bowl of a stand mixer fit with a whisk attachment, mix together sugar, salt, baking soda, eggs and egg yolk on low speed for about 1 minute. Add the buttermilk, oil and vanilla extract and mix on low again for another minute. Add the flour and mix on medium speed for 2 minutes. Add the cooled cocoa mixture and mix on medium speed for 3 minutes. *The batter will be very loose*. Pour into the prepared cake pan and bake for 1 hour, or until a cake tester inserted in the cake comes out clean. Let the cake cool completely in the pan and then invert onto a cooling rack. (I made my cake the day before and glazed it the day-of.) To make the icing: Chop the chocolate into small pieces, put them in a heatproof bowl (or a double boiler), and set the bowl over a pot of barely simmering water. Be sure that the bottom of the bowl does not touch the boiling water. Remove the bowl from the heat when all of the chocolate bits have melted. Melt the butter in a separate pan or the microwave. Whisk the melted butter into the melted chocolate until thoroughly incorporated. Sift in half of the powdered sugar. Add the sour cream and whisk to combine. Sift in the remaining powdered sugar and whisk until smooth. The glaze should be thick and shiny. Lastly, add the coffee and whisk to create a glossy glaze. Pour the glaze over the Bundt cake, covering it completely. Leave at room temperature until ready to serve.