A Korean chef taught me this trick! A brilliant fish recipe

Recipe:
1 kg potatoes.
Rinse and put in a baking dish.
30 ml sunflower oil.
Salt, spices to taste.
Lay out the fish fillet.
Salt, spices to taste.
1 onion.
1 carrot.
4 eggs.
Salt.
200 g mayonnaise.
200 g water.
100 g cheese.
Pour in the sauce.