2 tbsp lemon juice
1 large onion, roughly chopped
900g/2lb potatoes, peeled and cut into even-sized pieces
50g/2oz plain flour
salt and freshly ground black pepper
75g/3oz butter, plus extra for greasing
about 50g/2oz butter
4 hard-boiled free-range eggs, roughly chopped
570ml/1 pint milk
about 8 tbsp hot milk
350g/12oz fresh haddock, cut into 1cm/陆in pieces
350g /12oz undyed smoked haddock, cut into 1cm/陆in pieces