Instructions

1. Cut the oranges in half and squeeze out the juice into a large bowl. Add the greek yogurt, vanilla and sweetener (if using) to the juice and mix well with a spoon.
2. Pour the mixture into a freezer proof dish or container. I used a standard loaf tin but a plastic container will work fine too.
3. Freeze for at least 5 hours or overnight until the yogurt is solid. The orange halves will keep in the fridge until you are ready to use them.
4. Remove the frozen yogurt from the freezer about half an hour before you want to use it. Allow it to defrost slightly before scooping into the orange halves.