In a small mixing bowl, put Sour Cream (1/2 cup). Add Coffee (1/3 cup), freshly brewn. Mix them together.
In a large mixing bowl, put Butter (180 gram) and Brown Sugar (1 cup). Beat them together with an electric mixer. Add in Egg (3), beating the mix after adding each one. Then add in half of the Self-Rising Flour (2 cup) and Baking Powder (2 teaspoon) and mix them in. Mix in half of the coffee mixture. Mix in the other half of the flour and the remaining coffee mixture.
Grease a tin and line with baking paper. Spoon in the mixture. Preheat the oven to 180 degrees C (350 degrees F), and put in the mix for about 45 minutes. Leave the cake in the tin for 10 minutes to cool.
For the frosting: put Cream Cheese (250 gram) into a bowl. Add in Powdered Confectioners Sugar (1/2 cup) and Instant Coffee (2 teaspoon) dissolved in a little bit of warm water. Beat them together.
Spread the icing on the top of the cake. Serve!