Creamy leek, potato & ham pie - Good Food Middle East

Ingredients

• 120g butter, cut into cubes
• 300g plain flour, plus extra for dusting
• good pinch of salt
• 600g small floury potatoes, roughly the same size
• 2 tbsp olive oil
• 1 onion, finely chopped
• 500g leeks, cleaned and roughly chopped
• 3 garlic cloves, finely chopped
• 3 tbsp snipped chives
• 150ml half-fat crème fraîche
• 200g Lancashire cheese, grated
• 200g thinly sliced ham (we used Italian cooked ham)
• 1 medium egg, beaten