Composer Gioacchino Rossini (1792–1868) was a noted gourmand, and dishes with his name attached typically involve foie gras and truffles. This one was served in his honor at the Café Anglais in Paris.
In France, sauce bordelaise is based on a rich mixture of wine and brown stock. But Creole bordelaise, which Mandich uses in this signature oyster dish, is made with oil, scallions, and garlic.
The meaty breasts of moulard ducks work best in this recipe.