Heat grill pan, or skillet, to medium high heat. Brush fish with coconut oil.
In a large bowl, whisk together the flour, coconut flakes and salt and pepper. Coat fish filletswith flour mixture.
Place fish fillets on large individual aluminum foil sheets. Spoon mushrooms and leeks, dividedevenly, over fish. Season vegetables with salt and pepper, and cover with a second sheet of foil.
Seal edges and place packets on grill pan. Cook for 10 minutes, until fish flakes easily with afork and vegetables are tender. Serve warm with broccoli.