Combine sherry, gingerroot, soy sauce, honey and garlic in a 1 cup glass measure. Microwave uncovered at high 1 min. OR until mixture boils. cool slightly. Place tuna in a 11 X 7 X 1 1/2 in. baking dish. Pour marinade over tuna. Cover and chill 2 hours. Remove tuna from marinade, reserving marinade.

Preheat a 10 Inch. browning skillet on high for 8 min. Arrange tuna on hot browning skillet with thickest portions to the outside. Microwave uncovered on high for 2 min. Turn steaks over and baste with marinade. Microwave on high for 1 1/2 to 2 min. Let stand covered 2 min. Serve immediately with warm marinade. Makes 4 servings.