Admiral's Fish Pie - Pinch Of Nom

Ingredients

• 500 g potatoes
• 1 fish stock cube (dissolved in 450ml boiling water)
• 100 g fresh salmon (cut into chunks)
• 100 g fresh cod (cut into chunks)
• 50 g smoked haddock (cut into chunks)
• 4 spring onions (chopped)
• 1 handful of peas
• 100 g cooked king prawns
• 100 g cooked mussels
• 1 tbsp fresh parsley (chopped)
• 1 squeeze of lemon juice
• 1 tsp xanthan gum
• 3 tbsp quark
• salt and pepper to taste