Wash fish filets carefully in a cold water bath with lemon juice, a little salt, and a fistful of flour. Rinse well and pat dry.
For the marinade, mash the garlic and peppers with the salt in a mortar and pestle or chop well using a butcher’s knife. Add the remaining marinade ingredients and mix together, forming a paste. Rub this into the fish and set aside to marinate for 15–20 minute