Preheat oven to 300 degrees F, for two to three hours of braising
Pat Veal shanks dry. Season with salt and pepper. Coat veal in flour, and when pan is hot, brown veal on both sides in separate frying pan.
Choose heavy pot (dutch oven with lid) to cook vegetables, which can be put in oven.
Heat butter in dutch oven. Saute onion, carrot, lemon zest, celery on medium heat, 8-10 minutes. Then add garlic and cook a few more minutes.
Once vegetables are done, stir in white wine and cup of broth. Cook on low for ten minutes to cook off alcohol.
Add in tomatoes, thyme, bay leaf, parsley, thyme, salt and pepper. You want the veal to be covered 2/3 in broth.
Add in veal shanks. Cover and braise for 2-3 hours, until fork tender.
Serve with a garnish of gremolata.