Instructions: Cut beef into thin slices across the grain so its more tender. Put into a bowl, add marinade ingredients and stir. Drain juice from pineapple and cut each of the rings into 6 pieces. Heat wok, add oil and swirl it around to cover entire surface. Add beef and stir-fry 1 minute. Add pineapple pieces and sliced ginger, and stir-fry for 2 minutes. Add scallion and quickly stir it in; transfer to a heated plate and serve. The pineapple makes this a very cooling dish for the summer.

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