For the beer dough, mix 150 g flour and 1⁄2 tsp. salt. Separate 2 eggs. Put the egg whites in a cool place. First mix egg yolk and beer, then gradually stir into the flour until a viscous dough is formed.
Cover and allow to swell for approx. 30 minutes at room temperature.
For the sauce tartare, boil 1 egg hard, quench, peel and let it cool down. Peel the onion. Chop onion and cucumber finely. Wash parsley, shake dry, pluck off leaves. Chop parsley, capers and egg finely.
Mix everything with yoghurt and salad cream. Season with lemon juice, salt and pepper.
Heat the oil in a deep fryer or a high pot to approx. 180 °C. Beat 2 egg whites with 1 pinch of salt until stiff and fold into the beer batter. Wash the fish, dab dry and cut into bite-sized pieces.
First turn in flour, then pull through the dough and fry in portions in hot oil. Serve with parsley potatoes and a mixed leaf salad.