Breakfast Sausage Meets Meatloaf in This Cincinnati Breakfast Icon

Name: Breakfast Sausage Meets Meatloaf in This Cincinnati Breakfast Icon
Ingredients: 1 (3-pound; 1.36 Kg) bone-in pork shoulder, fat cap trimmed to 1/2-inch thick (see notes); 1 large onion (10 ounces; 284 g), roughly chopped; 3 stalks celery, roughly chopped; 2 bay leaves; 2 1/2 cups (400 g) pinhead or steel-cut oats; 1 1/2 tablespoons Diamond Crystal kosher salt; for table salt, use half as much by volume; 1 tablespoon freshly ground black pepper; 1 1/2 teaspoons dried ground sage; 1 teaspoon MSG (optional); Neutral oil, such as vegetable oil or bacon fat for pan-frying goetta slices