For the tilefish
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Bring the brown butter and vinegar to 129°F/54°C and place the fish filet in there for 8 minutes.
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Remove from the liquid and rest for 3 minutes.
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Grill to caramelize and crisp the skin (only cooking on the skin side).
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Spray the skin with pine-infused apple cider vinegar and re-apply to the grill quickly.
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This can be done in individual portions or a whole piece depending on preference and serving style.