In a small bowl mix together the soy milk and apple cider vinegar. Set aside for at least 5 minutes.
Preheat the oven to 350°F (175°C).
In a medium sized bowl, sift together the flour, sugar, cocoa powder, baking powder,baking soda and salt.
In a large bowl mix together the vegan yogurt, vegetable oil, vegan buttermilk, hot coffee/espresso, and vanilla extract.
Add the wet ingredients to the dry ingredients. Using a stand mixer or a hand mixer, mix until there are no lumps - about 30 seconds.
Generously grease a standard size bundt pan with vegetable oil. Be sure to get into every nook and cranny of your pan. A pastry brush works well for this. Sprinkle the inside of the pan with a bit of cocoa powder and turn the pan upside down and bang it on the counter to release any extra cocoa powder. Do not substitute flour for cocoa powder.
Pour the batter into the bundt pan and bake for 40-45 minutes, or until a toothpick inserted in the center comes out clean.
Let the cake cool for 15-20 minutes before inverting it onto a cooling rack or cake plate. This is important. Don't try to immediatly release your cake from the pan.
While the cake is cooling, make the vegan chocolate ganache. Drizzle the ganache over the bundt cake once the cake has cooled fully.