Easy Lunch! ~ Tuna and Avocado Pita from Shape.com: Halve and lightly toast a whole-wheat pita. Meanwhile mix together 1 pouch (about 2 ounces) tuna, 2 tablespoons spicy mustard, 1/4 cup each shredded carrots and chopped celery, and a dash each turmeric, cumin, and black pepper. Split tuna mixture between pita halves and top with sliced avocado.