Rinse turkey, pat dry, and cut into 8 equal-sized pieces (no more than 1 1/2 inches thick).
Mix cilantro, pepper, and 6 cloves of the garlic; pat mixture over turkey pieces, covering all sides.
Place pieces well apart in a shallow rimmed baking pan. Bake in a 500° oven until meat is lightly browned on outside and no longer pink in center; cut to test (10 to 12 minutes).
Meanwhile, in a food processor or blender, combine remaining 2 cloves garlic, tomato sauce, vinegar, sugar, and raisins; whirl until raisins are chopped. Offer raisin sauce to spoon over turkey to taste.