Preparation Place steaks and soy sauce in large resealable plastic bag. Seal bag, releasing excess air; turn to coat. Let steaks marinate at room temperature 2 hours, turning occasionally. Process porcini mushrooms in spice mill to fine powder. Mix 1 1/2 tablespoons mushroom powder, rosemary, and pepper in small bowl (reserve any remaining powder for another use). Drain steaks; pat dry. Sprinkle mushroom-rosemary rub generously over both sides of steaks, pressing to adhere. Heat oil in heavy large skillet (preferably cast-iron) over medium-high heat. Fry steaks until browned and cooked to desired doneness, about 8 minutes per side for rare, adjusting heat to medium if browning too quickly. Transfer steaks to plate; tent with foil to keep warm. Let rest 10 minutes. Cut into 1/2-inch-thick slices and serve. *Available in the produce section of many supermarkets and at specialty foods stores and Italian markets.
Preparation Place steaks and soy sauce in large resealable plastic bag. Seal bag, releasing excess air; turn to coat. Let steaks marinate at room temperature 2 hours, turning occasionally. Process porcini mushrooms in spice mill to fine powder. Mix 1 1/2 tablespoons mushroom powder, rosemary, and pepper in small bowl (reserve any remaining powder for another use). Drain steaks; pat dry. Sprinkle mushroom-rosemary rub generously over both sides of steaks, pressing to adhere. Heat oil in heavy large skillet (preferably cast-iron) over medium-high heat. Fry steaks until browned and cooked to desired doneness, about 8 minutes per side for rare, adjusting heat to medium if browning too quickly. Transfer steaks to plate; tent with foil to keep warm. Let rest 10 minutes. Cut into 1/2-inch-thick slices and serve. *Available in the produce section of many supermarkets and at specialty foods stores and Italian markets.