"Pork shoulder, a well-marbled cut available at most supermarkets, turns fork-tender after long, slow cooking. Ours is especially succulent with a spice rub and vinegar...."
INGREDIENTS
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1/4 cup packed light-brown sugar
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1/2 to 1 teaspoon cayenne pepper
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Coarse salt and ground pepper
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3 pounds boneless pork shoulder (Boston butt), cut into 4 equal pieces
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1 1/2 cups cider vinegar
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4 garlic cloves, minced
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8 soft sandwich rolls, split
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Store-bought barbecue sauce, for serving (optional)