Pre-heat the oven to 180°C / 160°C fan assisted /gas mark 4 / 350°F.
Line and grease an 8 inch (20cm) square cake tin.
Place the chocolate and unsalted butter in a large glass or metal mixing bowl.
Set the mixing bowl over a saucepan of barely simmering water and melt the chocolate and butter.
Once melted, removing the mixing bowl from the top of the saucepan and set aside.
In a large mixing bowl whisk the sugar and the eggs for two minutes until pale in colour and increased in size.
Mix in the vanilla extract and the salt.
Sift the cocoa powder, the almond flour and the salt into the bowl and mix well until thick and smooth.
Finally pour in the melted chocolate mixture and fold in until completely combined.
Pour the brownie batter into the prepared cake tin.
Bake for 25-30 minutes.
Remove the brownies from the oven and leave to cool to room temperature in the tin, then transfer the tin to the refrigerator to completely chill for 4 hours before removing the brownies from the tin and cutting.
Allow the brownies to come to room temperature before serving.