75²µ/2Β½΄Η³ϊ plain flour
50g/2oz plain flour
75²µ/2Β½΄Η³ϊ cornflour
soy sauce, to serve
vegetable oil, for deep-frying
1 free-range egg, lightly beaten
1.5kg/3lb 5oz uncooked king prawns, shells and central veins removed
188ml/6Β½fl oz beer