1. Whisk together sour cream and flour.
2. Wash leeks, then put in a large heavy skillet with butter, 1/3 cup water, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Cover with parchment, then with a lid, and simmer over medium heat, stirring once or twice, until leeks are tender, about 10 minutes.
3. Stir in sour-cream mixture and remaining 1/3 cup water.
4. Season fish with 1/4 teaspoon each of salt and pepper, then add to leeks and cook, covered with parchment and lid, until just cooked through, 8 to 10 minutes. Serve sprinkled with dill.
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