Grate onion or mince Very fine. Combine peppercorns, salt, thyme and sage in a spice mill and grind to a fine powder. Sprinkle onion and spices over the ground pork and mix well. Put the mixture through a meat grinder Or put it through a food processor, a little at a time. Cover and refrigerate overnight This mixture can be put in casings or made into patties. This sausage freezes very well.