Created by lazyme on March 14, 2015
Step 1: Preheat oven to 200°F.
Step 2: Sprinkle 1 side of tuna steaks with pepper.
Step 3: Heat 2 tablespoons oil in heavy large skillet over high heat.
Step 4: Place tuna steaks, pepper side down, in hot oil and sear 2 minutes.
Step 5: Turn tuna over and continue cooking to desired doneness, about 2 minutes for rare.
Step 6: Transfer tuna to rimmed baking sheet; keep warm in oven.
Step 7: Add butter, sliced green onions, cilantro, ginger and chopped garlic to same skillet and saute until fragrant, about 30 seconds.
Step 8: Mix in mushrooms and soy sauce and simmer 30 seconds.
Step 9: Add whipping cream and simmer until sauce lightly coats back of spoon, about 3 minutes.
Step 10: Stir in lime juice.
Step 11: Spoon sauce onto plates; arrange tuna atop sauce.
Step 12: Garnish with lime wedges and cilantro sprigs, if desire