Reduce the heat to low, add pancetta (or ham or bacon) and cook, stirring, until it begins to brown. Add carrots and cook, stirring, until they begin to soften, about 5 minutes. Add chopped onion and cook, stirring, for 2 minutes. Add garlic and flour and stir for 30 seconds. Pour in wine, scraping the solids from the bottom of the pot. Add tomatoes, broth (or water), the browned veal and the bouquet garni. Bring the stew to a simmer, cover the pot and transfer to the oven. Bake the stew, stirring occasionally, until the veal is tender when pierced with a fork, about 1 1/2 hours.