Preheat the oven to 180℃ and line a 9 inch springform tin with baking paper and baking spray, set aside.
In a heavy bottom sauce pot add the butter and brown it until nutty and a light brown color is achieved, should take 3-5 minutes deepening on the size of the pot and the heat. I like to do this on a medium heat.
Remove from the heat, add the Guinness beer and whisk. Add the cocoa powder, sugar and whisk again.
Add the yogurt, lemon juice and whisk until smooth. Add the eggs, vanilla and whisk again until smooth.
Add the flour, corn flour, baking powder, baking soda, salt and whisk until smooth.
Pour into the lined tin and bake for 45 - 50 minutes until a tooth pick inserted into the center comes out clean.
Remove from the oven and let it cool down completely, in the mean time make the frosting by beating fridge cold cream cheese until smooth, add the icing sugar and whipping cream, beat again and place in the fridge.
When the cake is cool remove from the tin and finish with the frosting on top. Slice and serve.