Anzac biscuits, baked in Australia and New Zealand for over a century, have a powerful connection to the national identity and culture of both countries. But what is the story of this national icon? Were they eaten by troops during the First World War? When did coconut make an appearance? And where do you stand on the crispy versus chewy debate? Culinary detective Allison Reynolds has travelled Australia, New Zealand and England delving into war files and family cookbooks to investigate the provenance of this extraordinary everyday biscuit.