1. Heat a large saucepan over medium heat. Add the olive oil to pan, swirling to coat. Add leeks and 1/2 teaspoon kosher salt to pan; cover and cook 6 minutes, stirring occasionally. Add 3/4 cup water to pan; bring to a boil. Cover, reduce heat, and simmer 6 minutes or until leeks are tender. Remove from heat. Stir in raisins, vinegar, and 1/4 teaspoon freshly ground black pepper; keep warm. Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Sprinkle fish evenly with 1/4 teaspoon kosher salt and 1/2 teaspoon freshly ground black pepper. Add fish to pan; cook 4 minutes on each side or until desired degree of doneness. Serve fish with leek mixture.