How to make Australian Chocolate Lamingtons

Recipe of an Australian chocolate and coconut coated sponge cake sometimes filled with jam. Named after Lord Lamington, history has it that the sponge cake was accidentally dropped in melted chocolate in the government house kitchen, it was then suggested to coat them in coconut to avoid messy fingers. The best recipes are always accidental. Now I know a traditional purist at heart will cringe at the thought of putting jam in the middle of a Lamington. But growing up as a kid in Australia, I always remem