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In stock pot large enough to hold the turkey, combine brining spices, sugar and water. Bring to a boil, reduce heat and simmer 15 minutes. Cool completely.
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Add turkey breast to pot. (The brining solution must completely cover turkey breast, add water if needed.) Refrigerate, covered, 12-24 hours. Rinse turkey breast inside and out after brining. Pat dry with paper towels.
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Arrange turkey breast on rack in shallow roasting pan. Refrigerate, uncovered 12-16 hours. (Allowing turkey breast to sit uncovered in refrigerator insures a deep golden skin when roasted).
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Combine butter and chipotle; rub over turkey skin. Season with pepper to taste. Roast in 325 F oven until meat thermometer reaches 165 F, (2-2½ hours). Let stand 10-15 minutes; (Temperature will rise 5-10 degrees while standing.) Transfer turkey breast to cutting board.
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Discard all but 2 tablespoons drippings. Add chicken broth to roasting pan and bring to a boil, scraping up browned bits in bottom of pan. Combine cornstarch and water. Stir into broth and cook, stirring until thickened.
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Slice turkey and arrange on serving platter. Serve with gravy.