INGREDIENTS
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1 (3- to 3-1/2 pound) boneless pork shoulder blade roast
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1 teaspoon salt
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1 teaspoon black pepper
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2 tablespoons vegetable oil
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2 3/4 cups water
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2 tablespoons white vinegar
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1/4 cup sugar
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1/2 teaspoon liquid smoke
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8 hamburger buns
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1 1/2 cups warm barbecue sauce (see Note)