Preheat the oven to 400 degrees F.
In a bowl combine vinegar, basil, shallots, garlic, tomatoes, salt, and freshly ground black pepper. Add the 2 tablespoons of the olive oil and whisk together. Slice the filet to desired thickness long-ways, leaving 1 end of the filet uncut so that you have a slice about 12 inches long. Lay the tomato mixture on the filet, and begin rolling to create the "roulade". Once the filet is filled and rolled tightly, tie it with butcher's twine around the middle of the filet to hold it together. Take the sprigs of rosemary and push them through the filet to create a seal. Heat a pan over medium-high heat and add the remaining 2 tablespoons of oil. Season filet with salt and pepper, to taste. Sear for 3 to 4 minutes on each side. Finish in the oven for 6 to 10 minutes, or until desired temperature is reached. Once out of the oven, remove the string and rosemary, and replace with new rosemary for garnish and to hold the filet together.
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