Feta Cheese Stuffed Turkey Burger

Ingredients:
¼ cup finely chopped red onion
1 teaspoon dried oregano
1 teaspoon grated lemon rind
½ teaspoon salt
¼ teaspoon freshly ground black pepper
1 pound ground turkey
6 tablespoons (1.5 oz) crumbled feta cheese
cooking spray
¼ cup grated English cucumber
¼ cup plain fat free yogurt
1 tablespoon chopped fresh mint
4 slices tomato (optional)
4 green leaf lettuce leaves (optional)
4 Kaiser rolls or hamburger buns

Directions:
Combine red onion, oregano, lemon rind, salt, ground black pepper and ground turkey.  Divide mixture into four portions.  Indent center of each portion; place 1.5 tablespoons feta into each.  Fold turkey mixture around cheese; shape each portion into a ½ inch thick patty.
Heat grill pan over medium-high heat.  Coat pan with cooking spray.  Add patties; cook 5 minutes on each side or until turkey is done and not pink any longer.
Combine cucumber, yogurt, and mint in a small bowl.  Arrange 1 turkey patty, 1 tomato slice, 1 lettuce leaf, and 2 tablespoons yogurt mixture on bottom half of each roll.  Top with top halves of rolls.
Serves 4