This is a variation of the great Australian Vanilla Slice. (Many will also know them as "Snot Blocks".) If you want to make a traditional Vanilla slice, just leave out the lemon zest. Passionfruit icing is also a great choice for the icing.
5 second chocolate coconut slice This slice is so simple it is ridiculous. It takes longer to get your ingredients out of the cupboard than it does to actually make it. It's great for a quick treat, fundraisers or school lunch box.