Cool Cucumber Soup

3 cups plain nonfat yogurt (Greek if possible)
2 cucumbers (about 1 pound), cut into chunks
1 scallion, white and green parts, coarsely chopped (about 1/4 cup)
3 tablespoons chopped fresh dill, plus sprigs for garnish
Salt and freshly ground black pepper
1 medium tomato, seeded and diced
2 teaspoons olive oil

In a blender, combine the yogurt, cucumber, scallion and dill. Pulse until pureed. Season, to taste, with salt and pepper. Ladle into individual bowls. Top each serving with 2 tablespoons of diced tomato, drizzle with 1/2 teaspoon of olive oil and garnish with a dill sprig.
Courtesy of Ellie Krieger on foodnetwork.com