In a medium bowl, combine the ground beef, egg, bread crumbs and onion. Mix thoroughly and shape into golf ball-sized balls.
In a large skillet over medium heat, gently brown the meatballs and set aside.
In a large saucepan, combine the brown sugar, flour, water, white vinegar and soy sauce. Mix thoroughly. Add meatballs and bring to a boil. Reduce heat and simmer, stirring often, for 30 minutes.
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