"Weber’s Big Book of Grilling..."
INGREDIENTS
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3 tablespoons unsalted butter
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1/4 cup minced yellow onion
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2 cups ketchup
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2/3 cup firmly packed light brown sugar
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1/2 cup yellow mustard
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1/2 cup cider vinegar
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2 teaspoons Worcestershire sauce
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1 teaspoon Tabasco sauce
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1 (4 -5 lb) boneless pork shoulder, rolled and tied (Boston Butt)
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kosher salt
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fresh ground black pepper
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hamburger bun