Blueberry thrill

Ingredients
Serves 2
scant 1/2 cup strained plain yogurt
scant 1/2 cup water
scant 1 cup frozen blueberries, plus extra to decorate

Method
1) Put the yogurt, water, and blueberries into food processor or blender and process until smooth.
2) Pour into glasses and top with whole frozen blueberries.