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Cut the wings at joints into 3 parts, discarding the tips (or buy them already cut).
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Dip wing portions into the beaten egg, dredge in flour and brown in a tablespoon of oil, in batches, adding more oil as needed. Remove wings to a roaster or large casserole dish.
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Combine soy sauce, water, vinegar and sugar and pour over wings.
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Bake in a pre-heated 350 degree oven for one hour, stirring occasionally and covering at the end if needed.
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I've guessed at the servings.