In a small bowl, combine the flour, baking soda, and salt. Set aside.
70 g cake & pastry flour, ¼ t baking soda, ¼ t salt
In a stand mixer with the wisk attachment, beat the eggs at high speed until light coloured, about 5 minutes.
4 large eggs
Gradually add the sugar, and continue beating until thick.
200 g granulated sugar
Change to the paddle attachment, and blend in the water and melted chocolate.
30 ml water, 60 ml melted 70% dark chocolate
Using a spatula or wooden spoon, fold the dry ingredients into the liquid mixture gently but thoroughly.
Spread the mixture into the prepared cake pan
Bake for 15 minutes or until cake springs back when lightly touched.
While the cake is baking, spread a clean tea towel out, and generously sift icing sugar over the top.
icing sugar
When cake has baked, loosen the edges, and turn out of pan immediately onto the tea towel
Remove the parchment paper
Beginning at the narrow edge, roll the cake up in the towel loosely, and allow to cool completely