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Combine soy sauce, wine, oil and ginger or garlic in a shallow bowl.
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Score meat with shallow cuts, criss-cross-style at 2-inch (5 cm) intervals and add to marinade, turning to coat meat.
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Cover and refrigerate for at least four hours but preferably overnight, turning occasionally.
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Remove meat from bowl, reserving marinade. Barbecue over medium-hot coals or at medium-high setting, brushing occasionally with marinade, 4 to 6 minutes per side, or until cooked to desired doneness.
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Remove from barbecue and let stand for 5 minutes, then cut diagonally across the grain, in extra-thin slices. Wrap well and chill.