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1
Mix together the cabbage, fennel, vinegar, redcurrant jelly, oil and about 1/4 tsp salt. Set aside for about 1 hour. Separate one of the eggs and mix together the egg yolk, 1/2 cup of the flour, cornstarch and beer until smooth. Set aside for about 15 mins.
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2
To make the tartar sauce, mix the mayonnaise and sour cream until smooth. Finely chop 1 onion and add to the mayonnaise with the capers and pickles. Season to taste with lemon juice, salt and pepper.
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3
Cut the remaining onion into thick rings. Beat 1 egg and the milk in a bowl and season with salt and pepper. Dip the onion rings first in the remaining flour, then the egg mixture, then in the breadcrumbs.
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4
Beat the egg white with 1/2 tsp salt and mix with the beer batter. Season the fish pieces, then dip in the beer batter. Heat the oil in a large skillet and fry the fish pieces for about 4 mins on each side until golden. Remove from the skillet, drain on paper towel and keep warm. Add the onion rings to the hot oil and fry for 2-3 mins until golden.
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5
Split open the bread rolls and spread with the tartar sauce. Place the fish on top, then the red cabbage salad, onion rings and lettuce leaves, (optional).