Slice meat diagonally into 3 or 4 pieces. Combine soy sauce, sugar, ginger, salt, pepper and garlic. Marinate steak pieces in this for at least 20 minutes. Pat both sides of each piece in flour. Add onions to beaten eggs and dip floured meat pieces into this mixture. Fry in about 1 1/2 inches of vegetable oil. Slice diagonally into 1/2-inch strips and top with chopped green onions if desired. May be served hot immediately or refrigerated and served cold later.