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1
Using the tip of a knife or the sharp tines of a carving fork, prick duck leg skin all over. Rub with garlic (slices should stick to skin) and season with 1 teaspoon ground pepper and 2 tablespoons salt.
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2
Preheat oven to 250u00b0F. Arrange duck skin side down in a roasting pan or large Dutch oven and add 8 thyme sprigs, 4 chiles (or 1 teaspoon red pepper flakes), and 1/2 cup water. Cover pan with foil or lid and cook until fat is rendered (don't be surprised: there will be lots), about 2 hours. Turn duck skin side up and nestle it into rendered fat. Cover pan and continue to cook until meat is very tender and bones easily wiggle when pulled, 2-2 1/2 hours longer.
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3
Meanwhile, bring vinegar, sugar, mustard seeds, rosemary sprig, remaining thyme sprig, 2 chiles (or 1/2 teaspoons red pepper flakes), 1 teaspoon salt, and 1 cup water to a boil in a medium saucepan. Reduce heat and simmer, stirring occasionally, until sugar is dissolved, about 3 minutes. Mix in raisins, remove from heat, and let cool at least 1 hour.
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4
Increase oven temperature to 400u00b0F. Remove duck from fat and place, skin side up, on a rimmed baking sheet; reserve fat for another use (it will keep 3 weeks in refrigerator or 3 months in freezer; reheat and strain before using). Season duck with cracked pepper and roast until skin is brown and crisp, 30-35 minutes. Serve duck with pickled raisins.
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5
DO AHEAD:
