Melt butter with cinnamon, pour over chocolate and blend. Whip eggs combined with sugar (⅔ stiffness), add the chocolate mass and mix with dry ingredients. Pour into a form. Bake for 30 minutes at 175°C. Cut the finished cake into 4 portions (20 x 5 cm) and refrigerate.
Lemongrass ganache
Heat milk to 80°C with lemongrass, chilli and honey. Set aside for 30 minutes. Drain, reheat, pour over chocolate and blend. Set aside to cool.
Roche confectionery compound coating
Heat oil to 80°C, pour over chocolate and blend. Add roasted nuts and mix.
Assembly
Fill the frozen brownie with ganache and re-frost. Coat the finished cake with roche confectionery compound coating and decorate with chocolate leaves.