Pre heat the oven to 160 degrees.
Prepare your brownie tin. Either line or grease.
Melt the butter in a pot.
Add and combine in this order. Stirring after each addition;sugar milk eggs self raising flour coconut lemon zest
Pour the batter in to the brownie pan.
Cook for 20 minutes. Check with a skewer (It will come out clean if the cake is cooked).
When the cake is cool prepare the icing.
Sift the icing sugar.
Melt the butter and add to the icing sugar.
Add the lemon juice and stir. If you need more moisture add the boiling water (You may not need it).
Ice the cake.
Use a hot knife to cut the slice.
