Tuna Salad Niçoise

Ingredients

• 1/2 teaspoon Dijon mustard
• 1 tablespoon red-wine vinegar
• 1 tablespoon olive oil
• Coarse salt and ground pepper
• 1/2 lb. steamed red potatoes
• 1/2 lb. trimmed and steamed green beans
• 3/4 cup cherry tomatoes halved
• 2 tablespoons Kalamata olives pitted and slivered
• 1 can (6 ounces) solid white tuna drained, packed in olive oil

Instructions

1. 1
   In a medium bowl, whisk together 1/2 teaspoon Dijon mustard with 1 tablespoon each red-wine vinegar and olive oil; season with coarse salt and ground pepper.
2. 2
   Add potatoes, green beans, 3/4 cup halved cherry tomatoes, 2 tablespoons sliced pitted Kalamata olives, and 1 can (6 ounces) drained solid white tuna packed in olive oil; toss well.