Thoroughly combine crumbs, onion, crab meat, egg, lemon juice and cayenne.
Spread on fillets; roll up and secure with picks.
Arrange fillets in 8x8-in dish.
Brush with butter.
Microwave stuffed fillets at High 5 to 7 minutes, or until fish flakes easily, rotating once.
Garnish with parsley.
Combine sauce ingredients in serving dish.