Melon soup makes a refreshing first course or dessert for a summer dinner, or even a healthy snack any time of day. It also makes good use of peak of season cantaloupe, when the fruit has that remarkable sweetness that's balanced by just a touch of welcome bitterness. In this flavorful version, the melon is blended with yogurt, lime juice and zest,and fresh ginger until creamy, then chilled and garnished with fresh basil before serving.