Combine salt, thyme, sage and peppercorns in spice
mill or mortar and grind to pwdr. Sprinkle onion and
spices over meat & fat in bowl and mix well.
Put 1/2 of mixture in food processor and process to
fine pure. Remove to bowl and repeat with remaining
1/2. Cover and refrigerate for at least 6 hrs., but
no more than 24 hrs.
Stuff casings, tying every 3". Refrigerate sausages
at least 12 hrs, or for as long as 48 hrs. For longer
storage, freeze.