Fit the K beater to the machine.
Line the square tin with parchment paper.
Pre heat the oven to 160°C.
Add Ingredients 1 (ground linseeds, water) to the small bowl.
Mix until combined and set aside.
Add Ingredients 2 (margarine, coffee, dark chocolate, water, vanilla extract) to the saucepan.
Heat on a low heat until melted.
Transfer contents of the small bowl to the saucepan.
Add Ingredients 3 (caster sugar) to the saucepan.
Mix until combined.
Add Ingredients 4 (almonds, cocoa powder, plain flour, baking powder, salt) into the Mixer bowl.
Attach the Mixer bowl to the machine and fit the splash guard.
Mix on speed 4 for 1 minute.
Transfer the contents of the saucepan into the Mixer bowl.
Scrape down the bowl.
Mix on speed 4 for 30 seconds.
Transfer the brownie batter to the square tin.
Bake for 40 minutes at 160ºC.
Leave to cool.
Serve.