INGREDIENTS
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1 1/2 lbs ground beef (ground shoulder roast is good)
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1 slice bread (broken or chopped finely)
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1 egg
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1 small onion , finely chopped
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1 teaspoon table salt
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1/4 teaspoon black pepper
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4 tablespoons ketchup
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1/2 cup whole milk
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Sauce
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4 tablespoons apple cider vinegar
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4 tablespoons dark brown sugar, packed firm (to taste)
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1/2 cup ketchup