1. Add all marinade ingredients and mix well with the mackerel. Marinate for 30 minutes. Grind the white radish.
2. Brush oil on the aluminum foil of oven tray. Place the marinated mackerel on the tray. Bake at 180 °C for 15 minutes until cooked and in golden color.
3. Dish up and garnish with lemon slices and minced white radish. Season with little sea salt. Ready to serve.