Recipe from the Australian War Memorial Encyclopedia:

ANZAC Biscuit Popular Version
(From a original recipe provided by Mr Bob Lawson, an ANZAC present at the Gallipoli landing)

Ingredients
1 cup each of plain flour, sugar, rolled oats and coconut
4 oz butter
1 tablespoon treacle (golden syrup)
2 tablespoons boiling water
1 teaspoon carbonate soda (add a little more water if mixture is too dry)

Method
1. Grease biscuit tray and pre heat oven to 180C
2. Combine dry ingredients
3. Melt together butter and golden syrup. Combine water and soda add to butter mixture.
4. Mix butter mixture and dry ingredients.
5. Drop teaspoons of mixture onto tray allowing room for spreading.
6. Bake for 10-15 minutes or until golden. Allow to cool on tray for a few minutes before transferring to cooling racks