Steps
1. Preheat the grill to medium-high heat.
2. In a small bowl, mix together the olive oil, lemon juice, thyme, parsley, salt, and pepper.
3. Place the mackerel fillet on a plate and brush the mixture evenly over both sides of the fish.
4. Grill the mackerel for about 4-5 minutes per side, or until it is cooked through and slightly charred.
5. Remove from the grill and let it rest for a minute before serving.
6. Serve the grilled mackerel with a side of steamed vegetables or a fresh salad.