INGREDIENTS
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20 asparagus spears, trimmed to 6 inches and halved lengthwise
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4 large radishes, very thinly sliced
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4 boneless, skinless salmon fillets, preferably wild sockeye (5 ounces each; 1 inch thick)
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Coarse salt and freshly ground pepper
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1 small red onion, thinly sliced
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1/4 cup plus 1 tablespoon thinly sliced lemon zest strips, plus 1 tablespoon plus 1 teaspoon fresh lemon juice
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3 tablespoons fresh tarragon
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1 tablespoon plus 1 teaspoon extra-virgin olive oil