Nibblous | a fish pie

Ingredients

• 5 large potatoes, peeled and diced into 2.5cm squares
• salt and freshly-ground black pepper
• 4 free-range eggs
• 125g-250g button mushrooms, wiped clean and sliced.
• 2 large handfuls of fresh spinach (or a not-very-big chunk of the frozen stuff, defrosted)
• 1 onion finely chopped
• 1 carrot, halved and finely chopped
• extra virgin olive oil
• approx 285ml double cream
• 2-4 good handfuls of grated mature Cheddar or Parmesan cheese
• Juice of one lemon
• 1 heaped teaspoon English mustard
• 1 large handful of finely chopped parsley
• 455g haddock or cod fillet, bones and skin removed and cut into strips
• Salt, pepper and nutmeg