In a medium bowl, combine remaining 2 Tbsp yogurt, remaining 1/4 tsp black pepper, 1/3 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. 1/2 cup each). Shape each portion into a patty (approx. 3/4-inch thick). In a separate shallow dish, place the remaining 1/3 cup panko. Dredge each patty in panko.