Put the gammon, onion, cloves and bay leaf in a large stock pot. Cover with the cider and bring to the boil, simmer for 1 hour (or 1 hour per 1kg + 20 minutes).
While the gammon is cooking you can make the pastry. Rub the lard and butter into the flour and salt to until the mixture is like fine breadcrumbs. Sprinkle enough water over the crumbs to bring the pastry together, but not too wet. Knead lightly on