Chicken Marinade

1 lb. boneless skinless chicken breasts, 1 1/2in. cubes
2 Tbsp lemon juice
2 Tbsp nonfat Greek yogurt
1 1/2 tsp dried oregano
1/4 cup red onion, chopped
2 cloves garlic, minced
1 tsp olive oil
salt and pepper
4 skewers
Tzatziki Sauce

1/2 cup nonfat Greek yogurt (or whatever is remaining from the 6oz. container)
1/4 cup grated cucumber, squeezed of excess water
1 1/2 tsp lemon juice
3 tsp fresh dill, chopped
1 clove garlic, finely minced
salt and pepper to taste
Extras

2 whole wheat pita pockets, cut in half
4 slices tomato
1/4 red onion, thinly sliced
2 cups shredded romaine
1/4 cup low fat crumbled feta cheese