Melt the butter in a large, heavy skillet, add the chopped onions and cook over moderate heat for 6 to 8 minutes, or until they color lightly. Scrape them in into a large mixing bowl. Add the sausage to the skillet, now set over medium heat, and break the meat up with a fork as it cools. When the meat is lightly browned, transfer it to a sieve set over a small bowl and let the fat drain through. Combine the drained sausage meat, cornbread crumbs, salt a few grindings of pepper, the thyme and parsley. With a large spoon, gently stir the ingredients together, then moisten with the sherry and cream. Taste for seasoning.

(The original recipes calls to brown the turkey liver in butter, then to chop and add it as well, but I always put it in the gravy.)