Fillet, from which excess water has previously been drained, should be thrown into a colander, dried with a paper towel and cut into slices 1.5–2 cm wide.
Prepare the batter: mix egg, water, finely grated cheese, dry Korean dough.
Prepare all the pieces of deep-fried macrurus at once: add salt, pepper to taste, sprinkle with lemon juice and roll in dry dough.
In a deep frying pan (in a deep fryer, in a saucepan), pour a large amount of vegetable oil so that it completely covers the pieces when frying, and preheat on the stove to 160 ° C.
Prepare paper towels on which you will spread the fried pieces. Take pieces of dry dough, dip in wet dough and deep fry 2-3 pieces on one side. Fry until golden brown and spread on a paper towel.
Prepare the sauce: cut the olives and gherkins into very small cubes, finely chop the greens and mix thoroughly with mayonnaise, wine, pepper and a teaspoon of lemon juice.