1 tbsp chopped fresh parsley or chives
2 fat, floury potatoes (Maris Piper, King Edward or Marfona are all good bakers)
1 tsp hot horseradish sauce or English mustard
sea salt and freshly ground black pepper
olive oil
flaked sea salt
2 large knobs of butter
2 handfuls grated mature cheddar
2 smoked mackerel or trout fillets