Mediterranean Tuna Salad with a Zesty Dijon Mustard Vinaigrette

Name: Mediterranean Tuna Salad with a Zesty Dijon Mustard Vinaigrette
Prep time: 15 min
Total time: 15 min
Cuisine: Mediterranean
Ingredients: 2 1/2 tsp good quality Dijon mustard; Zest of 1 lime; 1 1/2 limes, juice of; 1/3 cup Early Harvest extra virgin olive oil; 1/2 tsp sumac; Pinch of salt and pepper; 1/2 tsp crushed red pepper flakes, optional; 3 cans tuna, 5 ounces each (use quality tuna of your choice); 2 1/2 celery stalks, chopped; 1/2 English cucumber, chopped; 4-5 whole small radishes, stems removed, chopped; 3 green onions, both white and green parts, chopped; 1/2 medium-sized red onion, finely chopped; 1/2 cup cup pitted Kalamata olives, halved; 1 bunch of parsley, stems removed, chopped (about 1 cup chopped fresh parsley); 10-15 fresh mint leaves, stems removed, finely chopped (about 1/2 cup chopped fresh mint); Six slices heirloom tomatoes for serving; Homemade Pita chips or pita pockets for serving