1 onion, finely sliced
400g/14oz potatoes, chopped
2 tbsp plain flour
salt and pepper
150²µ/5Β½΄Η³ϊ breadcrumbs (made from 4-5 slices of bread, broken into breadcrumbs and dried slightly)
1 tbsp olive oil
25g/1oz butter
100²µ/3Β½΄Η³ϊ cream cheese
1 egg, beaten
360g/12oz frozen white fish fillets (such as Coley or Pollock), defrosted, skin and bones removed
300g/10Β½oz frozen peas