Chicken and ham, or chicken and bacon, are classic combos for a tasty pie filling. The addition of leek adds something extra. Yumminess, maybe.
In a large bowl, stir the salt into the flour, then add the water and lard. Mix thoroughly, tip out of the bowl and wrap in plastic film. Put the pastry in the fridge or freezer to cool to room temperature.
It's very important that both your pastry and the filling are cool before you assemble the pie, otherwise you'll get a soggy bottom.
Spoon the filling into the pie. Moisten the rim with cold water, then place the lid on it. Press all around the edge with your thumbs to form a good seal. If you like, you can do some fancy crimping.
Pierce the lid with a skewer - this allows the steam to escape during cooking and stops the pie from bursting. Glaze the top with beaten egg and put the pie in the oven to bake for about 40 minutes. Remember all ovens are different, so have a peek at the pie before the end of cooking to make sure it's not burning.
Serve with potatoes and one or two token vegetables.
Beaten egg to glaze the pie, vegetable oil to sauté the onion. If you can't get bacon in a big chunk, slices will do just fine.