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Pre-heat the oven to 170°C and grease a fairly large square or rectangle spring-form baking pan (mine was 27cm x 17cm / 10in x 7in).
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Slowly heat the chocolate and butter in a pan until just melted. Add the coffee to the water and stir until it is dissolved, then add to the chocolate mixture. Let the mixture cool for about 10 minutes, then add the milk and stir to combine.
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In a large bowl, whisk the sugars with the eggs, then add in the cooled chocolate mixture.
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Sift the vanilla sugar, flour, cocoa and pepparkaka spices (mix the above quantities of spices together then use 1½ tablespoons ONLY. Put the rest in a bag for use another time) together and then stir into the wet ingredients, and mix until well combined.
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Pour into the prepared tin and bake for around 20-25 minutes (until an inserted skewer comes out clean). Remove from the oven and allow to cool completely (leave the cake in the pan). Pop the brownie in the fridge for at least several hours, but overnight is better (it makes it so much easier to slice neatly, especially when it's fudgy like this one) before sprinkling with the icing sugar/pepparkaka mixture. Cut using a sharp knife warmed under hot water (then dried), adding maybe a touch of cream or ice-cream if you're feeling decadent. Enjoy!