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Method Prep:45min › Cook:1hr › Extra time:6hr15min › Ready in:8hr
Preheat oven to 200 C / Gas mark 6. Have ready two 25cm (10 in) cardboard circles. Generously grease a 23cm (9 in) springform cake tin with soft butter, and dust with flour.
Beat the egg whites until frothy, and gradually add 200g sugar. Beat just to soft peaks. In another bowl, beat the yolks with the milk, lemon zest, vanilla and salt. Fold this into the egg whites. Sift the flour over the egg mixture, and fold in.
Spread 325ml of the batter into the prepared tin. Bake for about 5 to 9 minutes, or until small, brown spots begin to appear on cake. Remove the cake from the oven, and remove layer from tin with a spatula. Dust the cake lightly with flour, and place on a rack to cool. Grease tin again, and repeat this process until all of the batter is used, about 6 times more. Place the layers between sheets of greaseproof paper, and cover with a towel. Chill layers for a few hours. Make the Chocolate Buttercream.
Layer the chilled layers on one of the cardboard rounds with the buttercream. Start with one layer; cover with the buttercream, and then press down with another layer to make a good seal. Repeat this with the remaining layers, but reserve one layer. Wrap the cake in cling film, and chill for at least 6 hours along with the remaining buttercream. Grease the other cardboard round with the butter, and place the last layer on it.
Place 200g sugar into a non-stick frying pan over medium heat. Allow sugar to cook until the edges look melted and brown. Begin stirring with a wooden spoon. Cook until the sugar becomes an amber colour, and is smooth. Carefully pour the caramel over the top of the last layer, and spread to the edges with an oiled knife. Quickly, using an oiled knife, indent the top of the caramel into 16 wedges. Allow to cool slightly, and then retouch the indents with the knife again. Place layer onto a counter top dusted with sugar, and allow the caramel to cool completely.
Place some more buttercream on top of the chilled torte, and top with the caramel round. Ice the sides with the remaining buttercream. Chill the torte before serving.