INGREDIENTS
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1 2 - 2 1/2 - pound boneless beef chuck roast
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2 medium onions, cut into wedges
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1 8 - ounce can tomato sauce
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1/4 cup water
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1 tablespoon yellow mustard
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1 -2 teaspoons prepared horseradish
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1/2 teaspoon salt
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1/4 teaspoon ground black pepper
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2 tablespoons all-purpose flour
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2 tablespoons cold water