You will also need a 10 by 15 inch jelly roll pan, parchment paper, cooking spray and icing sugar.
Whip the 2 egg whites for 3 minutes till they are nice and foamy, beat in the sugar then turn the mixer on low and add the flour and butter, mix till well combined
Colour the batter according to the design - I divvied it into 4
Draw the design out onto a 10*15 piece of parchment paper
Trace over with an icing bag
Freeze for 30 minutes
Spray with cooking spray before adding the cake batter
Preheat the oven to 350 degrees
Whisk the first four ingredients in a small bowl and set aside
Beat the eggs and sugar on medium speed for 3 minutes
Mix in the vanilla and oil
Fold in the dry ingredients with a spatula till combined.
Spread the cake batter over the frozen piped design after spraying it with cooking spray.
Bake for 9 minutes, check for doneness with a toothpick. Let is sit for 1-2 minutes
Flip the cake on to a clean tea towel/parchment paper dusted with icing sugar
Gently peel off the parchment to reveal your design
Now quickly dust a clean piece of parchment paper with icing sugar and flip the cake over so that the pattern is on the bottom
Roll it up from the short end to create the roll shape and set aside to cool completely
Break the chocolate into pieces and place in a medium sized bowl
Heat the cream till scalding and pour over the chocolate, stir until melted and smooth
Stir in the Dulce de Leche and refrigerate until cold
Whip for 3-4 minutes on medium speed until the frosting is light in colour and pillowy.
Gently unfurl the cake and spread all the frosting over the cake and roll it back up. Refrigerate for at least 2 hours then serve.
When I make this cake I like to do things in the following order
1.) Start the frosting by melting and combining the ingredients, refrigerate
2.) Draw and Pipe the Pattern, Freeze
3.) Preheat oven
4.) Make the cake batter and bake
5.) Whip frosting
6.) Furl the cake into a roll by following the steps in the instructions
7.) Let the cake cool then fill and refrigerate.
6.) Fill + refrigerate