To prepare the Bolognese sauce, first take the beef and in a pre-heated saucepan pour a drizzle of oil and add the beef.
Shell it well and let it brown. In the meantime, prepare the vegetables. Peel the carrot and chop finely. Then clean the celery and chop it too of the same size.
Finally, peel the onion and chop it. As soon as the beef is well browned, add the chopped vegetables.
Jumbled up and let it simmer for 5-6 minutes jumbled up and raise the flame. Let it brown without haste, the meat must seal well. Deglaze with the vegetable broth and mix again. As soon as the vegetable broth has evaporated, add the tomato puree.
Stir to incorporate it. Add a couple of more ladles of hot vegetable broth.
Cover with the lid, but do not close completely. At this point the sauce must cook for at least 2 hours. Check the sauce every 20 minutes and add more broth as needed. After two hours, taste the sauce with salt and pepper. Stir and your sauce will be ready.