Ingredients Meat & Poultry Beef Recipes Ground Beef Recipes Meatloaf 5.0 (1) Add your rating & review By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on June 12, 2017 Print Rate It Share Share Tweet Pin Email Servings: 10 Use this recipe to make our Meatloaf Sandwich. Ingredients 4 slices white bread, torn into pieces 2 ½ pounds ground beef 1 medium yellow onion, peeled and cut into eighths 2 cloves garlic 2 ribs celery, cut into 2-inch pieces 2 carrots, peeled and cut into 2-inch pieces ½ cup fresh flat-leaf parsley, leaves 1 large egg ¾ cup ketchup 4 teaspoons dry mustard 1 tablespoon salt 2 teaspoons freshly ground pepper 2 tablespoons brown sugar Directions Heat oven to 400 degrees. Place bread in bowl of a food processor; pulse until fine crumbs form. Transfer to a bowl; add ground beef. Place onion, garlic, celery, carrots, and parsley in food processor; pulse until finely chopped. Add to meat mixture; combine using your hands. Add egg, 1/2 cup ketchup, 2 teaspoons dry mustard, the salt, and pepper; combine thoroughly using your hands. Place in an 8 1/2-by-4 1/2-by-2 1/2-inch loaf pan. Combine remaining 1/4 cup ketchup, remaining 2 teaspoons dry mustard, and the brown sugar in a bowl; stir until smooth. Brush mixture over meatloaf; place in oven with a baking pan on rack below to catch drippings. Cook until a meat thermometer inserted into middle reaches 160, about 90 minutes. If top gets too dark, cover with foil, and continue baking. Rate it Print