Shrimp Louis Salad with Tomato-Tarragon Dressing

Ingredients

• 1/4 cup fat-free sour cream
• 2 tbsp water
• 1 tbsp tomato paste
• 1 tsp capers, drained
• 2 tsp tarragon vinegar
• 1 tsp prepared white horseradish
• 1/4 tsp dried tarragon
• 1/4 tsp salt
• 1/8 tsp black pepper
• 3 cups mixed baby greens or mesclun
• 1 lb cooked, peeled shrimp
• 1 yellow or red bell pepper, cut into thin strips
• 1/2 mediumavocado, thinly sliced
• 1 cup halved cherry tomatoes