Prepare a marinade of chopped onion crescents, celery cubes, vinegar or wine and lovage. In a deep dish put clean guts and gills of the fish and pour the marinade. Leave in a cool place for 1 hour. Cut out pieces foil for baking, is coated on one side with good fat in the middle is placed on a fish, well drained from marinade. Fish are smeared with a little olive oil and mustard and sprinkle with salt, ground black pepper, thyme and oregano. Fthe oil screw package and put a strong preheated BBQ. Packets bake 8-10 minutes on each side.