Preheat the oven to 325 degrees F (165 degrees C).

Put liver, ground pork, salt, pepper, allspice, and onion in a food processor or meat grinder and let it run until mixture is still slightly coarse.

To make sauce: Melt butter over low heat. Stir in flour until smooth. Add milk, stirring until smooth.

Combine sauce, egg, and meat mixture and stir. Put in a mold with bay leaves on top of mold and bake 1 to 1 1/2 hours.