Best cake and stars be prepared one day in advance. Heat the oven to 160 C. Deep form cake tin with butter. The butter (cut into pieces) and chocolate cake is placed in a pot. Add coffee dissolved in 50 ml water. All warm over low heat to melt the ingredients. While the chocolate melts, mixing the two types of flour with baking soda, the two types of sugar and cocoa in the sugar should not go lumpy. Beat the eggs and mix with sour cream. This mixture melted chocolate and pour in the flour and stir well - should get thin dough. Moves in the shape and bake for about an hour and a half or until the surface of the cake is firm. Allow to cool in the form - it is important to not remove too early because it can crack. The sides of the cake should be very carefully peel off the sides of the vessel and transferred to the grid to cool completely. The stars are made as shallow tray covered with baking paper. Both types of chocolate are melted separately. White chocolate is poured on the paper and spread a thin layer. On it are made with dark chocolate features in different directions, can be used spoon with which chocolate is spill as thin strips. Tray must be kept in a cool (but not in the refrigerator) until the chocolate mixture tightening, without getting too hard. With a pastry cutter to cut stars - at least 6 pieces. It is better to do more to have a reserve if some crushing. It is advisable to wipe tray after each cutting. For the white chocolate filling is heated cream, bring to the boil and immediately pulls the fire. Pour into the chocolate and stir to begin to melt. Add 1 tbsp of boiling water and stirred to give a homogeneous mixture. Pour into a small bowl and is removable for 1 hour, to toughen slightly. After stirring with an electric mixer until smooth and dense. Cake turned upside down cross is cut into three parts. The lower and middle part is smeared, but not until the end of the pieces and stick three. For the glaze of dark chocolate Heat the cream with the sugar until the mixture boil. Maha from heat, add chocolate and 1 and 1/2 tbsp boiling water and stir until a homogeneous mixture. Place the cake on a wire rack, which is furnished baking paper. The glaze is poured and distributed on the walls and top of the cake. Waiting to tighten and podredzhdat truffles in a row in the middle upper part, each truffle is supported by a star.