1 small green or red apple, cored and sliced into 1cm/¾in rounds
1 tbsp white vinegar or lemon juice
chopped lettuce, to serve (optional)
½ red onion, sliced into 1cm/¾in rings
mayonnaise, to serve (optional)
2 tbsp plain flour
salt and freshly ground black pepper
1 tsp caster sugar
olive oil spray, for frying
1 free-range large egg, beaten
2 pork loin steaks (about 150–200g/5½–7oz each)
2 burger buns or bread rolls, split, to serve
50²µ/1¾´Ç³ú panko breadcrumbs