Marinated and deep-fried mackerel is a delicious and crispy seafood dish. The mackerel fillets are marinated in a flavorful mixture of soy sauce, ginger, garlic, and sesame oil, which infuses them with a savory and aromatic taste. The marinated fillets are then coated in a light batter and deep-fried until golden and crispy. The result is a dish with a perfect balance of flavors and textures, with tender and juicy mackerel on the inside and a crispy exterior. Serve this dish with steamed rice and a side of vegetables for a satisfying meal.