INGREDIENTS
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1 medium fennel bulb, thinly sliced
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1 blood or navel orange, very thinly sliced, seeds removed
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1 Meyer or regular lemon, very thinly sliced, seeds removed
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1 red Fresno chile or jalapeño, with seeds, thinly sliced
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4 sprigs dill, plus more for serving
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Kosher salt and coarsely ground black pepper
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1 2-lb. skinless salmon fillet, preferably center-cut
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3/4 cup olive oil
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Flaky sea salt (such as Maldon)