Pull the leaves and stems from the strawberries. Peel and roughly chop the banana (see our tip for freezing both before making your smoothie).
Prepare your strawberries and bananas as described above. Pop them into a freezerproof container and freeze for at least 6 hours. Add to the blender with the rest of the ingredients (minus the ice) for an even cooler, creamier, thicker smoothie. This is also a great healthier ice cream alternative.