INGREDIENTS
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3 1/2 cups water, divided
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2 pounds stew beef
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1 large onion, diced
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1 large potato, peeled and cut into 1-1/2-inch cubes
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1 1/2 cups ketchup
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1/4 cup Worcestershire sauce
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2 tablespoons firmly packed brown sugar
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1 tablespoon salt (optional)
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1 tablespoon paprika (or hot paprika, if you want it truly Hungarian-style)
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1/4 teaspoon dry mustard
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3 tablespoons all-purpose flour