ChocoKahlua Cake with Blueberry Marble

This recipe is actually an experiment, inspired by brownies.

The main chocolate cake is composed of :
around 3 oz of dark chocolate melted with 1/3 cup butter.
Three eggs are whisked with 1/2 cup white sugar until light, and 1/4 cup of Kahlua is added.
The chocolate mixture is mixed into the egg mixture
then 1 1/2 cups of sifted flour, 1 1/2 teaspoons baking soda and a pinch of salt are mixed in until combined.
1/2 cup of small dark chocolate buttons are folded in.
Pour into well greased pan then swirl in blueberry sauce at the top (sauce is made by gently simmering blueberries with sugar and a little bit of water)

Bake for around 25 minutes in a pre-heated 180C oven, or until springy to touch.

*

Room for improvement is the manner of swirling in the sauce!