01 -
Preheat the oven to 320°F fan-assisted or 356°F conventional. Grease and line a cake tin with baking paper.
02 -
In a large bowl, whisk together the sugar, self-raising flour, and cocoa powder until evenly mixed.
03 -
Add vegetable oil, whole milk, and beaten eggs to the dry mixture. Stir until the batter is smooth and uniform.
04 -
Grate the zest of one orange directly into the batter. Then halve the orange and squeeze in the juice. Mix thoroughly to incorporate.
05 -
Pour the batter into the prepared tin and bake for 45 to 50 minutes until risen and springy to touch. Allow to cool in the tin for 20 minutes before transferring to a wire rack to cool completely.
06 -
Finely chop the chocolate and melt in the microwave for 60 seconds or until smooth. Stir and set aside to cool.
07 -
Whip the butter until light and fluffy. Sift in icing sugar and beat until smooth.
08 -
Fold the cooled melted chocolate into the butter mixture. Add cocoa powder and boiling water, folding gently until the buttercream is glossy and smooth.
09 -
Spread the buttercream evenly over the cooled cake. Arrange chocolate buttons in a circle at the center, attach red Smarties atop the buttons with buttercream, place edible eyes above, and break pretzels into antler shapes positioning them above the eyes.