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Combine the beef, brown sugar, vinegar and water in 6 quart cast iron or other heavy ovenproof pot.
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Bake at 375°F for 3 hours.
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Remove from oven; cool.
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Remove all fat and any bones.
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Shred beef; return to pot.
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Add mixture of catsup, mustard, onion and garlic; stir to blend.
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Reduce oven temperature to 300°F and cook, covered, for up to 4 hours.
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Stir every half hour, adding more water/ catsup to keep moistened.
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Serve on buns with the onion and cheese.
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Yield: 12-14 servings.