Preheat oven to 400C. Line a 16 x 12" pan with parchment paper. Beat the eggs and sugar until the mixture is thick and pale. Beat in the orange extract and the orange zest. Fold in the flour. Pour the mixture onto the prepared pan and smooth out with a spatula. Bake for 10-12 min. until lightly golden brown and springy to touch. Let cool in the pan.

Once the cake is cooled, make the filling by whipping the cream until stiff peaks (always use a bowl and whisk that has been in the freezer for about 20 min., the cream will whip so much faster). Add the sugar and whisk in. Melt the chocolate in the microwave and let cool slightly, add a small amount of the whipped cream to the chocolate and then add more until all is incorporated.

Carefully peel the paper from the cake, you can invert it onto another larger piece of parchment or wax paper, you will need this to help you roll. Spread the filling onto the cake and smooth out to cover completely. Using the parchment/wax paper roll up the cake from the long side. Wrap in the paper and refrigerate until ready to serve. Slice and serve.