Classic Meatloaf (The Food Lab)

Ingredients

• homemade or store-bought low-sodium chicken stock
• buttermilk
• ounce unflavored gelatin
• slices high-quality white sandwich bread, crusts removed and torn into rough pie
• ounces button or cremini mushrooms, cleaned
• anchovy filets
• teaspoon Marmite
• teaspoons soy sauce
• teaspoon paprika
• medium cloves garlic, roughly chopped
• small onion, roughly chopped
• small carrot, peeled and roughly
• stalk celery, roughly chopped
• tablespoons unsalted butter
• ounces freshly ground pork
• pounds freshly ground beef
• large eggs
• ounces cheddar, provolone, Monterey Jack, or Muenster cheese, finely grated
• finely minced fresh parsley
• Kosher salt and freshly ground black pepper
• For the Glaze
• ketchup
• packed light brown sugar
• cider vinegar
• teaspoon freshly ground black pepper