Dust veal with salt, pepper and flour.
Heat the oil in a cast iron casserole.
Sear the shanks, two at a time, on both sides; take care to not disturb the bone marrow.
Remove shanks and set aside.
In the same cast iron pan, cook onions over high heat until transparent, stirring with a wooden spoon.
Add tomatoes and juice; reduce 5 minutes.
Add orange juice, rind and wine.
Return shanks to pan, keeping the heat high.
Season with salt and pepper.
Simmer, covered, for 1 to 1 1/2 hours or until the meat starts to come away from the bone.
Serve with fettuccine or rice.