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Combine all the ingredients except for the steak in a large bowl. Whisk until thoroughly combined.
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Add in the three pieces of steak, coating all sides of the steak.
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Marinade the steak in the refrigerator for at least 1 hour or marinade it overnight.
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Heat a grill pan or grill to high heat.
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Remove the steak from the marinade, discarding the garlic and the green onion pieces.
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Grill on each for side for 4-5 minutes until steak is caramelized and it is cooked to about medium rare.
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Let the steak rest for about ten minutes.
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Slice the steak against the grain and service with ssamjang, grilled garlic and lettuce leaves.