Trim the tops off the sharon fruit, then roughly chop them and add them to your blender. Peel the bananas and break them into your blender. Tip in the sunflower seeds.
Pour in 250ml of the drinking yogurt and add a few ice cubes. Blitz for a few mins till smooth. Pour into glasses and serve.
Extra thick shake
For an extra thick smoothie, peel and slice the bananas the day before and freeze them overnight. Make the smoothie with the frozen bananas, leaving out the ice cubes.