Spelt Fish Pie with a Spelt Pastry Crust

Ingredients

• 250 g, Wholegrain Spelt Flour
• 125 g, Cold Unsalted Butter
• 1 Medium, Egg
• 2 tbsp, 2–3 Cold Water
• ½ tsp, Fine Sea Salt
• 1 tbsp, Olive Oil
• 1 Medium, Leek
• 2 cloves, Garlic
• 300 g, Cod Fillet
• 200 g, Smoked Haddock
• 100 g, Cooked Prawns
• 1 tbsp, Plain Flour
• 150 ml, Milk
• 150 ml, Fish or Vegetable Stock
• 1 tsp, Dijon Mustard
• Salt and Black Pepper
• 1 Egg, beaten