Heat oven to 375ºF. Grease rectangular baking dish, 13x9x2 inches. Mix ½ c. pesto, 3 tbsp lemon juice, 1 med carrot finely chopped (1/2 c.) and 1 med leek chopped . Place fish in dish. Spread vegetable mixture over fish. Cover and bake about 30 minutes or until fish flakes easily with fork.