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In a bowl combine soy sauce, rice wine, and brown sugar. Whisk together until sugar has dissolved.
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Stir in green onions, minced garlic and ginger.
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Pour sauce into a small sauce pan set over medium heat.
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Mix water with cornstarch to a thick paste consistency.
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Pour cornstarch mixture into sauce and whisk teriyaki sauce until it begins to boil and thicken, about 4 minutes.
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Toss in meatballs and heat until warm.
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Assemble the sandwiches by slicing bread and layering with meatballs, grilled pineapple, and avocado slices.