Prepare the Soffrito: Begin by peeling and finely chopping the carrots, celery, and onions.
2 white onions, 2 carrots, 2 stalks celery
Cook the Soffrito: Heat olive oil in a large pot and sauté the chopped vegetables until they are soft and fragrant.
Extra virgin olive oil
Add the Tripe: Cut the cleaned beef tripe into strips and add them to the pot with the vegetables, cooking until they are well-integrated and flavorful.
2.2 pounds about 4 cups beef tripe, cleaned and cut into strips
Incorporate Tomatoes: Add the peeled tomatoes to the pot, breaking them up slightly. Stir well to combine.
35 ounces about 4 1/4 cups canned peeled tomatoes
Simmer: Cover the pot and let the mixture simmer for about 20 minutes on moderate heat, then uncover, season with salt and pepper.
Salt, Black pepper
Final Touch: Just before removing from heat, stir in the grated Parmigiano Reggiano and mix well.
3 1/2 ounces grated Parmigiano Reggiano DOP
Serve: If necessary, cook a little longer to reduce the sauce so it's not too watery. Serve hot, accompanied by crusty bread and extra Parmigiano Reggiano if desired.