1 cup flour
1 1/3 cup beer
2 egg whites, whipped to soft peaks
generous pinch sea salt
freshly ground pepper (several turns of a pepper mill)
1/4 tsp cayenne
4 (9 ounce/250 gram) fillets haddock (or cod)
Whisk together flour and seasonings. Whisk in beer, then fold in egg whites.
Heat oil to 370F. Dip fish in batter. Lower into oil. Fry for a few minutes, turning over, until crispy and golden brown. Drain on paper towels. Season with sea salt.