Fall Salad of Corn, Cherry Tomatoes, and Oven-Roasted Green Onions

Name: Fall Salad of Corn, Cherry Tomatoes, and Oven-Roasted Green Onions
Yield: Makes 8 Servings
Ingredients: 3 tablespoons white wine vinegar; 1 1/2 tablespoons chopped fresh tarragon; 1 1/2 tablespoons Dijon mustard; 1 1/2 teaspoons sugar; 1 cup olive oil; 6 tablespoons sour cream; 18 green onions; 6 cups fresh corn kernels; 3 cups halved cherry tomatoes