Prep: 10 min plus chilling

Serves 4

1 litre natural low-fat yoghurt, well chilled
500g long ridged cucumber
500ml iced water or vegetable stock
1 tsp sea salt
Freshly ground pepper
Half tsp finely chopped mint
2 tbsp finely chopped dill
1 garlic clove, crushed
Fresh mint sprigs for serving

Method: Peel the cucumber and cut in half lengthwise. Scoop out the seeds with a teaspoon and discard. Finely chop the flesh. Combine the yoghurt, iced water or stock, sea salt and pepper in a liquidiser or blender (more successful than a food processor, which leaves it slightly bitty). Add the dried mint, dill, garlic and all but 1 tbsp of the diced cucumber, and whiz until pale green, smooth and frothy. Chill for at least an hour and serve in small, chilled bowls.

Add the reserved cucumber and top with a sprig of fresh mint.