TIP: It’s Ok if not all the peppercorns stick; you possibly can add them to the pan sauce in the next step. TIP: Add a pinch of peppercorns now in the event that they didn’t stick in step 3.) Simmer, flipping mushrooms occasionally, till sauce has thickened and mushrooms are coated, 1-2 minutes more. Step 2 - In a small saucepan, heat the cream till it virtually reaches a boiling level - but do not permit it to boil. Bring to a boil and cook until tender, 15-20 minutes. Just make sure you don’t cook them, as this may destroy the psychoactive substances.