Coat a large nonstick skillet with cooking spray; add oil. Place over medium-high heat; add leeks, and sauté 3 to 4 minutes or until soft. Remove from pan and set aside.
Sprinkle fish with 1/4 teaspoon salt and 1/8 teaspoon pepper. Add fish to pan; cook 3 to 4 minutes on each side or until lightly browned and fish flakes easily when tested with a fork. Remove from pan; set aside, and keep warm.
Add vinegar, honey, 1/4 teaspoon salt, and 1/8 teaspoon pepper to pan. Cook over medium-high heat 3 to 4 minutes or until reduced by half. Divide leeks evenly over fish; drizzle with sauce.
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