

Grease a cake tin with butter and line it with baking paper for easy removal.
In a saucepan over low heat, combine the chocolate, butter, coffee, sugar, and vanilla. Stir gently until melted and fully combined.
Remove the saucepan from heat. Stir in the biscuit crumbs, grated coconut, and walnuts until the mixture is evenly coated.
Spoon the mixture into the prepared tin, pressing it down to form an even layer. Refrigerate for 1-2 hours until firm.
Once set, turn the cake out onto a work surface and cut into slices.