Cut two veal shanks into 5 cm pieces. Roll shanks in flour and saute in butter over high heat until brown on all sides. Add salt, pepper, celery, onion, carrots, mushrooms, tomato, sage, and rosemary. Reduce heat, cover and braise for 10 minutes. Add white wine. Cover and gently simmer for 2 hours. The liquid should barely cover the meat. Just before serving, stir in the gremolada. This consists of the grated lemon rind, parsley, anchovy, and garlic. Serve with cooked rice.