The German Cucumber Salad

Ingredients
2 large cucumbers, peeled and thinly sliced
1 small onion, peeled and thinly sliced
3 small roma tomatoes, thinly sliced

For the Dressing:
1/3 cup low-fat sour cream
1/4 teaspoon Dijon mustard
1 tablespoon white vinegar
2 tablespoons low-fat milk
1/2-3/4 teaspoon sugar
1 tablespoon chopped fresh parsley
2 tablespoons chopped fresh dill
1/4 teaspoon pepper
1/4 teaspoon salt, to taste

Directions :
Place the cucumbers, onions and tomatoes in a large bowl. Set aside. In a small bowl, whisk together all dressing ingredients. Pour over salad mixture. Toss to coat well. Chill at least 2 hours before serving.