KALUGA, Russia—When the flashy American-style Black Bull steakhouse opened here six years ago, it was a sign that this Russian provincial city had arrived.

These days, the restaurant is preparing a new menu for a new era. Gone are the American and Australian cuts of beef now subject to a Russian ban. Gone, too, are expensive imported duck and the foie gras that once topped arugula salads. Head chef Yuri Skorinov says he will offer steaks from Uruguay, Russian duck and domestic brie fried to mask its provenance.

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