This is a simple mixture of papaya, strawberry, yoghurt and a touch of demerara sugar. The difference however is that in a sunripe smoothie, you use a tree ripened papaya, and leave it in the kitchen till it starts to go mouldy on the outside! Boom - you now have the juiciest papaya in England.
Let the papaya ripen at room temperature for several days after you buy it. That's the key to a juicy, tasty papaya!