Sift the flour, yeast and a pinch of salt into a large bowl and whisk in the beer to give a thick batter. It should be the consistency of very thick double cream and should coat the back of a wooden spoon. Thickly coat the cod cheeks with batter, carefully place half of them in the hot sunflower oil and fry at 180 degrees for four to six minutes until golden and crispy.
Remove from the pan, drain and place on a baking sheet lined with greaseproof paper, then keep warm in the oven while you cook the remaining fillets the same way.
