For the Cake:
300g all-purpose flour
500g caster sugar
100g dark unsweetened cocoa powder
20g baking powder
14g salt
250ml buttermilk at room temperature
250ml hot brewed coffee or espresso
4 eggs at room temperature
150 ml vegetable oil
30 ml pure vanilla extract
For the Buttercream:
300g LURPAK® salted butter, softened and cut into cubes
400g icing sugar (icing, powdered), sifted
2 tablespoons milk
5ml pure vanilla extract
3ml peppermint extract
Pinch of salt
Few drops of green food colour