Ingredients Meat & Poultry Beef Recipes Ground Beef Recipes Stuffed Beef Burgers 3.1 (18) 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 May 16, 2017 Print Rate It Share Share Tweet Pin Email Servings: 6 When the familiar hamburger of ground chuck holds a surprise inside, it's much more fun, and takes on a remarkably different personality. Ingredients 3 pounds ground chuck Coarse salt 1 ½ teaspoons freshly ground pepper 3 ounces thinly sliced fresh mozzarella, optional 1 tablespoon chopped fresh herb leaves, such as oregano or basil (optional) 12 grape tomatoes, halved (optional) Bacon-Onion Filling (optional) Cheddar-Mushroom Filling (optional) Vegetable oil, for brushing 6 hamburger buns, such as sesame Directions Using your hands, combine beef, 3 teaspoons salt, and the pepper in a bowl. Shape into 6 balls. Scoop a heaping tablespoon from center of each; reserve. Fill each burger with 1/2 ounce mozzarella, 1/2 teaspoon herbs, and 4 tomato halves; season with salt. Press the reserved meat over filling, pinching to seal. Gently flatten into patties (about 5 inches in diameter). Refrigerate, covered, until cold, about 1 hour. Preheat grill to medium-high (if using a charcoal grill, coals are ready when you can hold your hand 5 inches above grill for just 3 to 4 seconds). Brush grill and burgers with oil. Grill, flipping once, about 4 minutes per side for rare or 10 minutes per side for well-done. Toast buns, if desired. Serve burgers on buns. Cook's Notes Themozzarella will melt only if yourburgers are well-done. For more rareburgers, you can use it as a topping. Rate it Print