12 Condiments and Sauces You’re Storing IncorrectlyThe door of the refrigerator is often a chaotic and crowded place. An open jar of mustard will be safe to eat for a very long time in the pantry. An open jar of mayonnaise can become a breeding ground for bacteria if it is left at room temperature. Jams and JelliesAn open jar of jam or jelly should always be stored in the refrigerator. By understanding the science behind each of these condiments, you can be sure that you are storing them in the right way.