This subject comes up periodically. I could not find the historical emails!! T-Up: My son received fresh mushrooms (Oregon truffles) for Christmas. He's a foodie, but not a chile head. So...he used some of the fresh truffles in olive oil to flavor & preserve. However, from historical discussions regarding flavoring oils with chilies, I believe that there is a botulinum danger. At what temp/ degrees should he heat the olive oil/mushroom mixture to ensure health safety (????) Constance Allen