1 (6- to 6 1/2-pound) whole beef tenderloin, trimmed of fat, silverskin, and the chain (see Cooks' Notes); or a 5- to 5 1/2-pound well-trimmed tenderloin roast
4 ounces diced pancetta
2 pounds grape tomatoes
Salt
Freshly ground black pepper
6 large garlic cloves, finely chopped
2/3 cup pitted kalamata olives, quartered lengthwise (3 ounces)
1 1/2 cups water, divided
1 1/4 cups panko (Japanese bread crumbs)
5 tablespoons extra-virgin olive oil, divided
5 tablespoons Dijon mustard
2 tablespoons finely chopped fresh rosemary
1/4 cup finely chopped flat-leaf parsley
Special equpment: Kitchen string; large (18- by 13-inch) rimmed baking sheet; large heavy roasting pan; instant-read thermometer
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