Seared Arctic Char with Cucumber Relish

Preheat oven to 425°.

Place cucumber, shallots, cilantro, mint, lemon juice, Dijon mustard, 1/4 teaspoon kosher salt, and 1/4 teaspoon sugar in a medium bowl, stirring to combine.

Heat a large ovenproof skillet over medium-high heat. Add oil to pan, and swirl to coat. Sprinkle the fillets evenly with remaining 1/8 teaspoon salt and pepper. Add fish to pan, skin side up. Cook 2 minutes; turn over. Place pan in oven, and bake at 425° for 4 minutes or until fish flakes easily when tested with a fork. Serve fillets with the cucumber mixture.