The perfect baked potato

Ingredients

  • 2 fat, floury potatoes (Maris Piper, King Edward or Marfona are all good bakers)
  • olive oil
  • flaked sea salt

For the smoked fish melt filling

  • 2 smoked mackerel or trout fillets
  • 1 tbsp chopped fresh parsley or chives
  • 2 handfuls grated mature cheddar
  • 1 tsp hot horseradish sauce or English mustard
  • 2 large knobs of butter
  • sea salt and freshly ground black pepper