Step 1

To make the zesty mustard vinaigrette, in a small bowl, whisk together the Dijon mustard, lime zest, and lime juice. Add the olive oil, sumac, salt and pepper, and crushed pepper flakes (if using), and whisk again until well-blended. Set aside briefly.

Step 2

To make the tuna salad, in a large salad bowl, combine the tuna with the chopped vegetables, Kalamata olives, chopped fresh parsley and mint leaves. Mix gently with a wooden spoon.

Step 3

Pour the dressing over the tuna salad. Mix again to make sure the tuna salad is evenly coated with the dressing. Cover and refrigerate for half an hour before serving. When ready to serve, toss the salad gently to refresh.

Step 4

Serve in pita pockets for a sandwich dinner. Or to serve as an appetizer, transfer to a serving platter and add pita chips and sliced heirloom tomatoes on the side. If you like, serve a portion of the tuna salad over the sliced heirloom tomatoes. Enjoy!