Combine the berries and maple syrup in a small pot and bring to a boil. Cook for 5 minutes until the berries just start to break down and release their juices. Turn off and cool.
Combine the yoghurt, coconut milk, vanilla extract and lime zest. Divide the berries between 4 glasses, then fill each with yoghurt, being careful not to fill more than ¾ olf the way up. Add 3-4 biscuits to the yoghurt, side by side. Chill for 3-4 hours or overnight before serving.