Tuna and Chickpea Pita Sandwiches

fat-free or low-fat Greek yogurt

light mayonnaise

fresh lemon juice

chopped fresh parsley

chopped fresh rosemary or 1/2 tsp dried crushed

chopped fresh thyme leaves or 1/4 tsp dried

(4.5 - 5 oz) cans white albacore tuna, drained well

chickpeas (aka garbanzo beans), drained and rinsed

chopped celery

finely chopped red onion

Salt and freshly ground black pepper

medium tomatoes (, sliced)

spinach

Whole wheat pita pocket bread