Tim's Midwestern Dressing

Ingredients

• 1 12 cups onions, minced
• 3 cups celery, chopped
• 2 cups butter, melted
• 18 cups bread, slightly dried and cut into 1-inch cubes
• 4 teaspoons salt
• 3 teaspoons sage leaves, crushed
• 2 teaspoons thyme leaves
• 1 teaspoon pepper
• 2 cups mushrooms, sliced
• 1 cup turkey drippings