Preheat the oven at 400 F (200 C).
In a small bowl mix all the ingredients for the tahini sauce.
Spread 2 teaspoons tahini sauce on each pita and than add1 1/2 tablespoon chopped olives, tomato, onion and artichoke pieces.
Top with 2-3 teaspoons crumbled feta and a few pine nuts.
Bake in the oven for 10 minutes.
Cut in quarters and serve.