The primary ingredient in a traditional Bolognese sauce is ground meat, often a mixture of beef and pork. This classic Italian sauce, known as ragù alla Bolognese, typically features a base of sautéed onions, carrots, and celery, known as soffritto. The sauce is then simmered with tomatoes, wine, and herbs to develop rich flavors. Bolognese sauce is commonly served with pasta, especially tagliatelle, and is known for its hearty texture and savory taste, making it a staple of Italian cuisine.