TIP: It’s Ok if not all of the peppercorns stick; you can add them to the pan sauce in the subsequent step. TIP: fresh white alba truffles Add a pinch of peppercorns now if they didn’t stick in step 3.) Simmer, flipping mushrooms often, until sauce has thickened Quality Black and White Truffles mushrooms are coated, 1-2 minutes more. Step 2 - In a small saucepan, heat the cream until it virtually reaches a boiling point - however don't allow it to boil. Bring to a boil and cook until tender, 15-20 minutes. Just be sure you don’t cook them, as it will destroy the psychoactive substances.