Slice the foie gras into 1/2-inch bias slices. Set aside. To prepare the caramelized fruits: in a saute pan, heat butter and sugar and cook until caramelized. Over high heat, deglaze with 1/2 cup sweet wine. Reduce slightly, and then add the apples, apricots, and grapes. Add the remaining 1/2 cup sweet wine and reduce until fruits are caramelized. Reserve but keep warm.
In another saute pan, reduce the red wine and mulberries until desired consistency. Season with salt and pepper. Season the foie gras slices with pepper. Dip in flour and in a saute pan over high heat, saute for 1 minute on each side. To plate: arranged the caramelized fruits on plate. Spoon mulberry wine sauce reduction around fruits. Top with sauteed foie gras. Serve immediately.
Recipe adapted from Walter Eselboeck of Taubenkobel Restaurant