Fresh Tuna Steaks in Ginger Beurre Blanc

Thanks to the proliferation of sushi bars in America, fresh tuna is now available in many fish markets. In addition to the usual nigiri-zushi (compact ovals of vinegared rice draped with slices of fresh fish) and sashimi (sliced fresh fish), Japanese chefs are experimenting with tuna in Continental-style preparations, too. This is a divine-tasting dish that pairs lean tuna with a rich and pungent ginger sauce.