Lamb Leg Steaks with Shitake Sauce

2 lamb leg steaks - about 3/4" thick (or 6 lambchops)
2 tablespoons peanut oil

3 tablespoons butter
1/3 cup green onions -- thinly sliced
1/4 cup cilantro -- chopped
2 tablespoons finely chopped peeled fresh ginger
4 cloves garlic -- chopped
8 ounces shiitake mushrooms - raw -- fresh, stemmed, caps sliced
4 T soy sauce
1 1/2 cups heavy cream
3 tablespoons lime juice -- freshLime wedges -- (optional)
cilantro -- Fresh sprigs (optional)

Directions: Sprinkle 1 side of steaks with fresh black pepper. Heat 2 tablespoons oil in heavy large skillet over high heat. Place steaks, pepper side down, in hot oil and sear 2 minutes. Turn temperature down to medium and continue cooking to desired doneness, about 5 minutes per side. Set aside, keeping warm in oven. Add butter, sliced green onions, cilantro, ginger and chopped garlic to same skillet and saute until fragrant, about 30 seconds. Mix in mushrooms and soy sauce and simmer 30 seconds. Add whipping cream and simmer until sauce lightly coats back of spoon, about 3 minutes. Stir in limejuice. Spoon sauce over steaks, and garnish with lime wedges and cilantro sprigs, if desired.