Combine all ingredients in a re-sealable plastic bag. Squeeze out as much air as possible and marinate the steak in the refrigerator at least 8 hours or overnight.
Heat up a non stick pan to high heat. Sear the pineapple rings in butter for 3-4 min on each side and set them aside.
Repeat for the steaks and serve with grilled scallions or ginger rice.
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