1770 House Meatloaf from Barefoot Contessa. Preheat the oven to 350 degrees. Heat the olive oil in a large (12-inch) sauté pan over medium heat. Add the onion and celery and cook for 5 to 7 minutes, stirring occasionally, until the onion is translucent but not browned. Set aside to cool slightly. Place the beef, veal, pork, parsley, thyme, chives, eggs, milk, salt, and pepper in a large mixing bowl. Put the panko in a food processor fitted with the steel blade and process until the panko is…