please check the ingredients and measurement in the description below. In two different bowl separate the egg white and egg yolk. Now on medium high with electric beater or you can use a whisk beat the egg white for 2 minute and then add half of the sugar and mix until you reach soft peaks. In another bowl now whisk the egg yolk until light and then add the rest of the sugarand mix until you have Peale fluffy batter. Now sift in the cocoa powder and the flour and mix with a whisk or electric beater just until combined. gradually in 3 portion add the egg white to the rest of the mixture and mix carefully because you don't want to over mix it which can lead to a heavy cake now spread the mixture in a 20 by 25 inch pan. make sure you spread it the side as well. and bake for around 13 to 15 minute depending on your oven check it by 13 minute and if you cake is not bake then bake for longer once you cake has been baked then leave it to cool down and then sift some icing sugar on it whip some whipping cream with some sugar and vanilla and then spread it evenly on the cake and with help of the parchment paper roll the cake together. On top of the cake pour chocolate ganache on it and spread evenly until the cake is fully coated and then let it set at room temperature or in the fridge for at least half an hour. once the cake has set make some swirly patter on it with the help of a fork cut one corner of the cake and stick it to the rest of the cake to make it look like a log and sprinkle some icing sugar and your log cake is ready.