Heat grill to medium. Season the salmon with 1/2 teaspoon salt and 1/4 teaspoon pepper; arrange on the plank. Place the plank on the grill and cook, covered, until the salmon is opaque and flakes easily, 12 to 15 minutes. In a bowl, combine the cucumber, jalapeño, lemon juice, oil, and 1/2 teaspoon salt. Serve with the salmon.
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