1 pound rockfish fillets
1 quart water
2 lemon slices
1/2 teaspoon salt
=== DILL SAUCE ===
1 1/2 teaspoons finely-chopped onion
1 tablespoon butter or margarine
1 tablespoon flour
1/4 teaspoon salt - (to 1/2 tspn)
1/4 teaspoon crushed dill weed
1 dash freshly-ground black pepper
2/3 cup reserved poaching liquid
1 1/2 teaspoons lemon juice
1 egg yolk
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