1. Combine 2 tablespoons mayonnaise, 1 tablespoon juice, 1 1/2 teaspoons mustard, and next 7 ingredients (through egg), stirring well. Add panko; toss. Shape mixture into 8 (3-inch) patties.
2. Heat oil in a large skillet over medium heat. Add patties; cook 5 minutes on each side or until browned.
3. Combine remaining mayonnaise, juice, and mustard with parsley, capers, garlic, and salt, stirring well.