Process livers and ham in your food processor till finely chopped. Add sausage meat, thyme, egg and salt. Let machine run for 10 seconds, then stir in the truffles.
Line a terrine mould with lard and make sure to have some overhang so you can cover the pate with it. Tip the mixture into the mould and even it out with a spatula. Scatter the bay leaves on top.
Fold the extra lard over the pate and cover the mould with a lid or with aluminium foil.. Bake for 1 hour. Let cool, then refrigerate for at least 1 day before slicing.