Beat the flour, beer and a pinch of salt into a creamy dough. Beat the egg white until stiff and fold into the batter. Let the dough rest in the refrigerator for about half an hour.
If necessary, pull the fish fillets through the batter and fry them in sufficient hot oil (approx. 3-4 minutes).
Drizzle the fish with vinegar, like in England (caution) and serve with french fries.