Steps
1. Pat the mackerel fillet dry with paper towels and season both sides with salt and black pepper.
2. Heat olive oil in a non-stick skillet over medium-high heat.
3. Place the mackerel fillet skin-side down and cook for 3-4 minutes until the skin is crispy.
4. Carefully flip the fillet and cook for another 2-3 minutes until cooked through.
5. Remove the fillet from the pan and set aside.
6. In the same pan, reduce heat to low, add butter and garlic, sauté for 30 seconds until fragrant.
7. Stir in lemon juice and chopped parsley, then remove from heat.
8. Spoon the lemon herb sauce over the mackerel fillet.
9. Garnish with a lemon wedge and serve immediately.