INGREDIENTS
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4 bone-in, skin-on chicken breast halves (about 12 ounces each), trimmed of excess fat and skin
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Table salt
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Vegetable oil for cooking grate
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4tablespoons (1/2 stick) unsalted butter, softened
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1medium shallot, minced (about 3 tablespoons)
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4teaspoons chopped fresh tarragon leaves
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2ounces fontina cheese, rind removed, cut into four 3 by 1/2-inch sticks
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4thin slices prosciutto (about 2 ounces)
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Ground black pepper