Combine first 6 ingredients in a small bowl; cover and chill. overlap potato slices around edge of a round 30 cm platter. Cover and microwave at high for 3 minutes. Uncover and place fish in a ring inside potatoes with pieces end to end. Mound broccoli in center of platter. Sprinkle fish and potatoes with lemon juice; cover. Microwave at high 8 minutes or until fish is cooked through and potatoes are tender, giving dish a half-turn at 4 minute intervals. Serve with a dill sauce.