Pre-heat oven to 160ºC (320ºF). Line a baking tray with parchment paper, set aside.
In a large mixing bowl, add flour, oats, coconut, both sugars and orange zest. Mix well to combine.
In a small pot, combine butter and golden syrup over a low-medium heat. Stirring occasionally, heat until butter has completely melted. Remove from heat.
In a small bowl, add baking soda and pour over the boiling water, mix quickly to combine. Immediately pour into butter mixture and allow it to froth. Once frothing, straight away pour over dry flour mixture. Mix with a wooden spoon to combine well.
Pick up approx. 2 tablespoons worth of mixture and roll into a ball (each should weigh approx. 30g).
Place on lined tray and press down firmly using the palm of your hand to flatten into a round biscuit. NOTE: these biscuits don’t really spread, only puff up slightly.
Bake for 8-10 minutes or until golden around the edges and slightly golden on top.
Remove and cool on pan for 5 minutes.
Transfer to a wire rack to cool completely.
Serve and enjoy!