Make a batter. To do this, drive an egg into a bowl, add flour.
Salt. Add seasoning.
Pour in kefir.
Stir until smooth.
Roll the fish in batter. Heat vegetable oil in a frying pan. Put the fish in a frying pan, fry the fish in butter until golden brown (tender fish is fried quickly, watch out for readiness).
Turn the fish over, cover, leave the fish in batter in a frying pan for 10 minutes.