A note on the amount of butter in this recipe: we use more butter than the earliest Anzac biscuit recipes, as they were too dry in test after test, but we use less butter than most modern-day recipes, and more golden syrup.
We've been baking this recipe in hot climates and humid kitchens and the biscuits always turn out perfectly. In response to a couple of recent reader observations that their biscuits were too dry, I waited and tested the recipe again in a cold kitchen in the middle of winter in Australia and found the mixture a tad dry, but not overly so, and added 1-2 tablespoons of butter. Do channel your grandmothers and use your instincts and if your mixture is too dry, add a little more butter - or golden syrup This is a very forgiving recipe.