Cheese and Onion Pie

h4. For the ShortCrust Pastry # Sift the flour into a bowl with the salt and rub in the butter until the mixture resembles breadcrumbs. # Make a well in the centre and add the eggs and a little water and mix together until a smooth paste is formed. # Wrap in cling film and chill for 1 hour. h4. For the Filling # Place the onions, water and butter in a pan and bring to the boil then season with the salt and pepper. # Allow to cook until just tender, then remove from the heat and cool. Drain the liquid off when cold. # Keep the cheese to one side and add when assembling the pie. h4. Assembly # Roll out the pastry and use 2/3 to line the pie tin. Bake blind 15 minutes, 180°C. Cool. # Put alternate layers of grated cheese and the onion mixture in the pie case, until the pie is full. # Cover with a pastry lid and brush with egg wash. # Bake at 180°C for 15 minutes until golden.