Bring a large saucepan of water to a boil and blanch the pearl onions for 3 minutes to make it easier to peel them. Drain and slice off the root ends with a sharp paring knife. Peel by squeezing to pop off the skins.
In a small skillet, heat 1 tablespoon of the olive oil over medium-high heat, then cook the onions until softened, 3 to 4 minutes, stirring. Remove and set aside.
In a large casserole, heat the remaining 2 tablespoons olive oil over medium-high heat, then brown the breast or rib roast on both sides, 4 to 5 minutes. Season with salt and pepper. Add the garlic, mushrooms, and the onions. Stir to distribute around the casserole and pour in the wine and tomatoes. Reduce the heat to low and cook for 2 hours, stirring the sauce occasionally. Add the olives and cook another 15 minutes.
Transfer the veal breast to a serving platter. Surround the breast with the remaining vegetables in the casserole using a slotted ladle. Spoon some sauce over the veal breast and serve.
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