How to Make It
In a large enameled cast-iron casserole, heat 1 tablespoon of the olive oil. Add half of the veal, season with salt and pepper and cook over moderately high heat until browned all over, about 8 minutes. Transfer the veal to a plate. Repeat with another 1 tablespoon of olive oil and the remaining veal. Pour off the oil.
In the casserole, melt the butter in the remaining 1 tablespoon of olive oil. Add the celery, onion and carrot and cook over low heat until softened and golden, about 12 minutes. Add the wine and boil over moderately high heat until almost evaporated, about 12 minutes. Add the tomato sauce, rosemary and veal, along with any accumulated juices. Cover and simmer over low heat, stirring once or twice, until the veal is very tender, about 1 hour and 15 minutes. Stir in the parsley and lemon zest and season with salt and pepper. Spoon the Baked Polenta with Parmesan into bowls, top with the veal stew and serve.