Ham, Leek and Potato pie – Parsnips and Pears

Ingredients

• 2 Tablespoons of Butter
• 1 Large Onion, finely chopped
• 3 L Leeks, finely sliced
• 2 Large Potatoes, cut into small cubes
• 2 Tablespoons Plain Flour
• 300ml Chicken or Ham Stock
• 100ml pot Crème Fraîche (or use leftover double cream)
• 2 tsp Wholegrain Mustard
• 200g Cooked Ham, shredded
• 375g Pack Puff Pastry
• 1 Egg, beaten, to glaze (or use milk)