Add all the wet ingredients to a bowl or jug and mix well.
Add all the dry ingredients to a mixing bowl and stir to combine.
Add the wet mixture to the dry mixture and stir until just combined. DO NOT over mix. Just mix until you cannot see any dry bits of flour. Work quickly. You will start to see bubbles forming as you mix and the quicker you get it in the oven the better the cake will be.
Place in the centre of your oven and bake for 40 - 50 mins or until a toothpick or skewer inserted into the centre comes out clean.
Add lime juice 1 tablespoon at a time, stirring well between each addition. You won't need as much as you think you will. Stop when you have a thickish, but pourable icing. If you add too much lime juice just add a little more powdered sugar.
Pour the icing over the top of the cooled cake. It looks good when you let it run down the side in little streams.
Grate a little lime zest on the top to add a pop of colour!