INGREDIENTS
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1 tablespoon unsalted butter
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1 large (about 2 cups) thinly sliced onion
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1/2 teaspoon kosher salt
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3 tablespoons cider vinegar
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1/2 cup barbecue sauce
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1/2 cup water
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4 cups (about 1 pound) leftover chopped cooked turkey breast
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1/4 teaspoon freshly ground black pepper
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6 (1 1/2-ounce) Kaiser rolls or hamburger buns, split and warmed
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Dill pickles (optional)
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Hot sauce (optional)