Toasted Sesame Seed-Crusted Turkey Meatballs with Sweet Harissa Yogurt Sauce

1 c plain Greek-style yogurt

2 tbsp honey

1 tbsp harissa paste

1 tbsp orange juice

2 tsp dried Valencia orange peel

1 tsp ground ginger

1/2 tsp ground Saigon cinnamon

1 lb GROUND TURKEY

1/2 c finely chopped onion

1/4 c plain bread crumbs

1 egg, beaten

1-1/2 tsp ground allspice

1 tsp ground coriander seed

1 tsp ground cumin

1 tsp dried mint flakes

1 tsp Sicilian sea salt

1 tsp coarsely ground Tellicherry black peppercorns

2 (1.62-oz each) jars sesame seeds, toasted