Add all butter to a saucepan and brown
once brown, add 1Tbsp espresso powder and mix
once mixed, add the coffee ice cube and let melt
In a separate bowl, whisk together eggs, vanilla and sugar
once combined, sift in cocoa powder, 1Tbsp espresso powder and salt
fold in the browned butter and coffee mixture
fold in the melted dark chocolate
sift in the flour and fold together
chop 100g of dark chocolate and 100g of milk chocolate into small pieces
add chocolate to mixture and combine
move mixture to a lined baking tin and flatten out
chop remaining 170g of dark chocolate into small pieces and drop them on top of the batter
cover in plastic wrap and refrigerate for 3 days
bake at 180°C for 30 minutes
remove from oven and cover with tinfoil
place the brownies straight in the freezer for 30 minutes
take the brownies out of the freezer and place in the fridge for another 24 hours.