"Ask for a thick center-cut piece of halibut, which makes for the nicest presentation...."
INGREDIENTS
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1 tablespoon coriander seeds, plus more very coarsely chopped for serving
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4 leeks, white and pale-green parts only, halved lengthwise, cut crosswise into 2" pieces
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8 sprigs cilantro, cut into 2" pieces, plus leaves for serving
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1 cup olive oil
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1 lemon, thinly sliced, seeds removed
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Kosher salt
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1 3-pound skinless halibut fillet, halved lengthwise