Carefully dredge both sides of the veal shanks in flour.
Heat up some oil in a large skillet over medium-high heat and brown the shanks on each side for about 3 minutes. When they are golden, take them off the pan and set aside.
Throw in some onions, celery, and carrots into the same skillet and allow to soften for around 5 minutes. Pour in some white wine and scrape up any crispy bits from the base of the pan.
Add a tomato into the mixture, cooking for an additional 2 minutes before transferring everything (including all sauce/liquid) to a stock pot with the shanks already in it. Let this mixture boil before reducing the heat and simmering for 1½ hours.
While it's cooking, wrap up some bay leaves, rosemary, thyme, and garlic cloves in a 4 inch piece of cheesecloth and tie it together with kitchen twine to form a bouquet garni. Place this into the stock pot and let it cook along with the other ingredients.
When the osso buco is ready, discard the bouquet garni and season with some sea salt and freshly ground black pepper to taste. Sprinkle on some parsley before serving to guests, providing a delicious meal that's sure to be enjoyed!