Cool Cucumber and Dill Soup+ingredients

3 cucumbers - 2 peeled, seeded and chopped; 1 coarsely chopped for garnish
1 1/3 cups lowfat yogurt
1 1/3 cups lowfat milk
2 tablespoons roughly chopped fresh dill
1/2 teaspoon ground coriander
1 teaspoon fresh lemon juice
2 teaspoons chopped fresh flat-leaf parsley
1 tablespoon chopped fresh mint