In a large bowl, combine the cucumbers, green onions and parsley. In a small bowl, combine sour cream, dill, vinegar, salt, mustard and pepper. Pour over cucumber mixture and toss to coat. Divide among eight salad plates and top with tomato slices.
Nutrition Information per serving:
28 Calories; trace Fat (7.7% calories from fat); 2g Protein; 6g Carbohydrate; 1g Dietary Fiber; 1mg Cholesterol; 148mg Sodium. Exchanges: 0 Grain(Starch); 0 Lean Meat; 1 Vegetable; 0 Fat; 0 Other Carbohydrates.