Cook tortellini according to package directions; drain. Plunge into ice water to stop the cooking process; drain and place in large bowl. Stir in tuna and next 5 ingredients.
Whisk together mayonnaise, red wine vinegar, and herbes de Provence. Add oil in a slow, steady stream, whisking constantly until smooth. Pour over tortellini mixture, tossing to coat. Stir in salt to taste. Cover and chill at least 25 minutes. Garnish, if desired.
*1 tsp. dried Italian seasoning may be substituted.
Note: For testing purposes only, we used Rosetto Cheese Tortellini.
