Instructions:
Rub tenderloins with salt and pepper. Grill over medium fire for 12-15 minutes, rolling every 3-4 minutes. Allow to stand for 5 minutes before serving.
While tenderloin is cooking, begin sauce. In large skillet over medium-high heat, melt 2 tablespoons butter. Add onions, salt and pepper and cook until onions are golden, about 15 minutes. Add jam, wine, balsamic vinegar and tomatoes and bring to a boil.
Remove from heat. Toss in blackberries. Carve resting tenderloin into 1/2-inch slices and serve with sauce.
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