Pour and measure stout and allow to stand 30 minutes for the foam to subside before incorporating into the batter.
Melt ¼ cup of unsalted butter in a small saucepan. Allow the butter to first foam, then the solids to begin to brown slightly, about 4 to 6 minutes. Cool the butter slightly. Use a pastry brush to paint butter into every nook and cranny of a 12-cup Bundt pan. Place Bundt into refrigerator, as temperature will solidify the butter exactly where you brushed it.
In a large bowl combine flour, cocoa, baking soda, ginger, cinnamon, nutmeg, cloves, and sea salt. Whisk together until combined. Set aside. In a small bowl, combine brown sugar, vegetable oil, and eggs whisking until just incorporated. Scrape the wet ingredients into the bowl of a stand mixer fitted with the paddle attachment. Add in the molasses and mix on medium-low speed for 1 minute. Add the stout and mix on low for 2 minutes. Keep the speed on low, as mixing on a higher speed will cause the stout to foam.
Add the previously mixed flour mixture to the molasses mixture and mix until just combined paying special attention not to over mix.
Remove prepared Bundt pan from refrigeration and set it on the counter to come back to room temperature slightly. Preheat your oven to 350°F. Pour batter into the pan. Give it a shimmy and a shake to ensure the batter settles into all of the crevices, especially if you are using a cake form that has lots of detailed ridges.
Bake for 50 minutes or until a cake tester or wooden pick inserted into the center of the cake pulls clean or with only minimal moist crumbs clinging to it. Remove the cake from the oven and place on a wire rack for 10 minutes before performing a cake release atop the cooling rack by inverting the rack and the pan. Allow the cake to cool completely, at least 3 hours. (If making ahead, place the cooled cake on a cake platter and wrap the cake closely with plastic film. The longer the cake sits wrapped, the more the flavors intensify.)
When ready to glaze, select from the glazes below or choose one of your own. If you prefer to omit glaze and garnish instead with sugared cranberries, simply dust the cake with powdered sugar right before serving.