Milk and soda crash with sugar, cocoa, flour and the oil (with mixer). Add 3 vanilla. After the break it all added egg white from the egg, broken with a fork and stir the mixture. Pour into greased pan with sunflower oil and bake in preheated oven at medium temperature around 180C. For the cream, egg yolk mix with 1/3 cup powdered sugar. Insert 1 tbsp cocoa, add 1 vanilla 2 tbsp of margarine peak. Stirring it with a mixer. Once cooled cake smeared with cream. You can sprinkle with grated chocolate or walnuts and put in refrigerator to stand 1-2 hours.