INGREDIENTS
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1 cup cubed seeded peeled cucumber
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1 1/2 cups fat-free sour cream
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2 tablespoons chopped green onions
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2 tablespoons chopped fresh dill
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1 1/2 teaspoons fresh lemon juice
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1 teaspoon prepared horseradish
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3/4 teaspoon kosher salt, divided
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1 (3-pound) salmon fillet (about 3/4 inch thick)
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1/4 teaspoon freshly ground black pepper
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Cooking spray
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Dill sprigs (optional)