Pre-heat the oven to 170°C (325ºF).
Prepare a large square/rectangle baking tin by lining it with baking paper or greasing. A pan with a length of around 13" (34cm) would work well.
Slowly heat the chocolate and butter in a pan until just melted.
Remove from the heat, then add in the coffee or milk.
In a large bowl, whisk sugars together with the eggs.
Add the vanilla and the cooled chocolate mixture and stir until well combined.
Sift the flour and cocoa, and stir into the wet ingredients until just combined.
Pour into the prepared tin and push the cherries down into the top.
Bake for around 20-30 minutes (see note 3).
Remove from the oven and either allow it to cool completely or serve it warm with ice-cream. Enjoy!