1. Toss mushrooms and half of garlic with two teaspoons truffle oil, enough olive to coat them all, and salt and pepper. Place the mushrooms in a greased baking dish.
2. Season the salmon steaks with one teaspoon truffle oil, a little lemon juice, salt, and pepper. Layer the salmon steaks on top of the mushrooms.
3. Roast at 400 degrees Fahrenheit for about 20 minutes.