Select a heavy-bottomed pot with a cover, just large enough to hold the osso buco in one layer. Combine the butter and the oil in the pot and heat until hot but not smoking. Add the veal, and brown well on all sides over moderate heat.
Transfer the veal to a platter. Add the vegetables to the pot, and cook until just softened, about 5 minutes.
Return the veal to the pot and add the white wine, the stock, and the tomatoes. Season to taste with salt and pepper. Cover the pot and bring to a boil, and then turn heat to low. Simmer gently for about 1 1/2 hours, turning the meat occasionally and adding a little additional stock to the pot if necessary. The osso buco is done when the meat is very tender and the sauce is slightly thickened. Transfer the osso buco to a platter and keep warm.
Prepare the gremolata. Combine the parsley, lemon zest, and garlic in a small bowl. Season to taste with salt and pepper. Sprinkle the gremolata over the osso buco and serve on warm dinner plates.
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