750 grams of watermelon cubes
500 ml of plain yogurt
2 tablespoon of sugar (optional)
Set aside a few pieces of fruit to use as a garnish.
Puree the remaining fruit in a blender .
In a large bowl, whisk 500 ml ( 2 cups) plain yogurt until creamy, then blend in the fruit puree. Add sugar (if liked).
Chill thoroughly. To serve, pour into tall glasses, add a little crushed ice and garnish with the reserved fruit.