Formatted by Manny Rothstein Slice crusts off bread and cut bread into 1/2-inch cubes. Spread on jellyroll pan and toast in 375-degree oven until lightly browned, about 15 minutes, tossing every 5 minutes. Toss toasted bread cubes with sage and salt in mixing bowl. Drizzle with 1/2 cup melted butter and set aside. Remove sausage from casings and break apart. Heat 1 tablespoon butter in large saute pan, add sausage and brown, breaking up in pan. Remove sausage. In same pan, saute onion, bacon and celery in same fat until onions are soft. Add sausage, onion mixture, apple and chestnuts to bread cubes and toss well to mix. Stir in beaten eggs. Makes 8 cups stuffing, about 16 servings. Each serving contains about: 263 calories 792 mg sodium 65 mg cholesterol 15 grams fat 21 grams carbohydrates 12 grams protein 0.57 gram fiber. From Julianne Ryan, Special to The Times, Copyright Los Angeles Times, November 16, 1995