In a medium bowl, combine remaining 2 tablespoon yogurt, remaining ¼ teaspoon black pepper, ⅓ cup panko, red bell pepper, onions, dill, lemon rind, lemon juice, salt and egg white. Add crab and gently stir. Divide crab mixture into 4 equal portions(approx. ½ cup each). Shape each portion into a patty (approx. ¾-inch thick). In a separate shallow dish, place the remaining ⅓ cup panko. Dredge each patty in panko.