600g/1lb 5oz floury potatoes, peeled and cut into large chunks
1 unwaxed lemon, zest only (optional)
lemon wedges, to serve
3 spring onions, finely sliced
2 tbsp mayonnaise
50²µ/1¾´Ç³ú plain flour, plus extra for dusting
salt and freshly ground black pepper
100g/3½oz dried breadcrumbs
6 tbsp vegetable, sunflower or light rapeseed oil, for frying
2 knobs of unsalted butter, for frying
1 large free-range egg
2 x 213g tins salmon, drained well, large bones and skin removed
100g/3½oz frozen peas