Is it true that food preservation can be done using oil and vinegar?

Yes, it is true that food preservation can be done using oil and vinegar. The acidic vinegar helps prevent the growth of bacteria, while the oil creates an airtight seal that slows down the oxidation process and prevents the food from drying out. This method is commonly used for pickled or marinated foods such as pickles, and olives. However, it is important to note that not all foods are suitable for preservation using oil and vinegar, and other preservation methods may be more appropriate for certain types of food.