Heat one inch of oil in a wok or skillet over medium heat.
Deep fry three tablespoons of garlic until fragrant and golden brown. Be careful not to burn the garlic. Set aside.
Dust prawns lightly with tapioca flour. Deep fry until they turn pink and the crust is golden brown. Remove and set aside.
In a wok or skillet, heat one tablespoon of oil over medium heat. Add the remaining tablespoon of garlic, fermented black beans, chili peppers, and ginger slices, and cook for one minute, stirring constantly to prevent burning.
Add wine, soy sauce, and oyster sauce, and sugar to the wok, and cook until the sauce is reduced slightly. Add the prawns and stir to coat with sauce.
Remove ginger slices and top with fried garlic. Serve immediately.