There is no one answer to this question as everyone has their own secret ingredient in their bolognese sauce. However, some common ingredients that people use to make their bolognese sauce include ground beef, onions, garlic, carrots, celery, red wine, tomatoes, and tomato paste. These ingredients are all simmered together until they are cooked through and the flavors have melded together.
No matter what ingredients you use, the key to making a good bolognese sauce is to take your time and let it simmer for several hours. This allows all of the flavors to come together and create a rich, delicious sauce. So, if you're looking to make a tasty bolognese sauce, be sure to give yourself plenty of time and don't be afraid to experiment with different ingredients to find your perfect recipe.