1. Preheat broiler to high. (I used MicroPro Grill)
2. Mix together the turkey, feta, onion, dill and garlic. Form into 4 patties (I used the Hamburger Press and Save set)
3. Place the patties together on a broiler pan and slide it under the broiler. Broil for 4-5 minutes on each side. ( I grilled 2 at a time in the MicroPro Grill, 4 minutes on first side and about 3 minutes on the 2nd side without preheating)
4 Whisk together the mustard, vinegars, salt and pepper in small bowl.
5. Toast the buns if desired.
6. Spread a thin layer of top half of each bun.
7. Place a cooked turkey burger on the bottom half of each bun and about 1/2 cup arugula. Sandwich top bun on top of burger to serve.