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4
Medium
Published 1965
Heat butter and oil in a saucepan; add chopped onion and parsley stalks, season to taste with salt and freshly ground black pepper, and sauté, stirring continuously, until onion is transparent. Sprinkle with flour and stir until well blended; add clam juice and wine, and simmer gently for 20 minutes.
Place mustard in the top of a doubl