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Mix together ground beef, green onions.
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minced garlic, rice wine, soy sauce, sesame oil, corn starch, sesame seeds, and sugar together in a bowl.
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Shape meat mixture into 1" balls.
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Place on large pan and refrigerate for at least an hour to retain shape.
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Soak approximate 20-25 wooden skewers in warm water for 20-30 minutes (this prevents the wood from burning).
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Prepare grill or heat broiler (I prefer charcoal grill).
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Thread 2-3 meatballs per skewer and grill over medium coals 5-6 minutes per side or until juices run clear.
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Serve with sweet and sour sauce and hot table mustard, if desired.
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To prepare a simple table dipping mustard, mix mustard powder with a small amount of water to make a pleasant consistency; allow to ripen 5-10 minutes.