Chilled Curried Carrot Soup with Herb Yogurt Sauce

Name: Chilled Curried Carrot Soup with Herb Yogurt Sauce
Ingredients: 2 tablespoons unsalted butter; 1 white onion, diced; 1 tablespoon ginger, grated; 2 garlic cloves, grated; 1 teaspoon hot madras curry powder; 1 teaspoon curry powder; 1 bay leaf; 1.5 pounds carrots, peeled and cut into chunks; 3 cups chicken broth; 1 cup canned unsweetened coconut milk; .5 cups plain Greek yogurt; 1 tablespoon Thai basil leaves, chopped; 1 tablespoon cilantro, chopped; 1 tablespoon mint, chopped; 1 lime, cut in half; Salt and pepper