cucumber and avocado soup

I just made this, from foodtv.com - tastes quite good.

I made doubly quantities, in two batches - this is as much as you want in a blender.

1/2 medium cucumber
1 ripe small California avocado
1 scallion
1 garlic clove
2 tablespoons fresh coriander leaves
2 tablespoons fresh lemon juice
1/2 cup plain yogurt
1/2 cup cold water
1/2 cup ice cubes
Garnish:
2 fresh coriander sprigsPeel cucumber and cut into 4 pieces. Quarter avocado, removing pit, and peel. Cut scallion into large pieces. In a blender puree all ingredients until smooth and season with salt and pepper.

Serve soup garnished with coriander.