In a medium bowl combine melted butter, tarragon, 1/2 teaspoon salt, and lemon juice. Mix well until you get a creamy sauce. Add the julienned vegetable and mix well. Set aside.
Cut two squares of parchment large enough o hold the fish and vegetables.
Spray the fish fillets with oil and apply salt and pepper to both sides of the fillets.
Lay one filet down on each parchment square. Top each fillet with half the vegetables. Pour any remaining sauce over the vegetables.
Fold over the parchment paper and crimp the sides to hold fish, veggies and sauce securely inside the packet. Place the packets inside the airfryer basket.
Set your airfryer to 350F for 15 minutes. Remove each packet to a plate and open just before serving.