Preheat oven to 180 degrees Celsius
Mix all dry ingredients together in a large bowl
Whisk eggs and milk together using an electric mixer on medium speed or hand whisk
Add dry ingredients to the wet, add 2tbs rum and mix on low speed in a standing mixer (or my hand) until smooth.
Rub the inside of your lamb pan with cold butter, making sure you apply some to all the crevices in the lamb's face and lamb's neck.
Cover all the butter surfaces with a thin layer of flour by shaking the pan gently (see video)
Pour cake batter into the prepared pan.
Place into preheated oven and bake for 40-50 minutes. Test whether cake is done with a toothpick or wooden skewers.
When done, take out of the oven and let the cake cool inside the mold.
Then gently turn out onto a wire rack and allow to cool completely.
When cool, stand your cake up on a serving platter and dust with sugar or decorate with cream cheese frosting using a piping bag.