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Combine all the ingredients in the center of a piece of cheesecloth that is large enough to hold the herb sprigs, and tie in a bundle with butcher's string.
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1. Preheat the oven to 350u00b0F.
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2. Season the beef with salt and pepper, then lightly dust with flour. Melt the butter in a large (6-quart) flameproof casserole set over medium-high heat. When it is foaming, add the beef and brown it on all sides, 5 minutes. Add the celery, onions, carrot, and sacchetto di spezie. Cook, stirring occasionally, until the vegetables soften slightly, about 2 minutes. Raise the heat to high and add the bottle of wine. Cook until the wine begins to boil, about 2 more minutes, skimming off any fat that rises to the surface.
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3. Strain the porcini mushrooms through a fine-mesh sieve, reserving the liquid. Rinse the mushrooms under cold running water to remove any grit, and add them to the casserole along with the strained mushroom liquid, tomato paste, and tomatoes. The liquid should just cover the meat. If it does not, add chicken broth or water. Cover the casserole and bake it in the oven until the meat is cooked through and tender, about 2 hours. Remove the meat from the casserole to a cutting board, cover with aluminum foil, and set aside.
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4. Strain the broth through a fine-mesh sieve and discard the vegetables and herb bag. Pour the broth back into the casserole and set it over high heat. Bring to a boil and add the arrowroot and the 1/4 cup wine. Cook to reduce and thicken the liquid, about 5 minutes. Carve the meat into 1/4-inch-thick slices. Serve immediately, spooning some of the broth over each portion.
