INGREDIENTS
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1-1/2 pounds chuck roast
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2 onions, sliced
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¾ cup cola
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¼ cup worcestershire sauce
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¼ teaspoon ground red pepper
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1 tablespoon vinegar
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2 cloves garlic
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½ teaspoon dry mustard
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½ teaspoon chili powder
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½ cup ketchup
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2 tablespoons butter